I began investing in 2005 while still in medical school. In 2007, I started trading on the Brazilian stock exchange. 

By 2008, I was investing in the forex market using automated robots. For many years, I saw good returns with my stock portfolio in Brazil. 

Through day and swing trading with robots in forex, I had excellent years and others not so much; my results were unstable, though I tended to win more than lose. 

In 2020, I started investing in cryptocurrencies with robots, and in 6 months, I turned $32,000 into over $1 million. I stopped trading and exited this market upon identifying the end of that bull market cycle. 

Also in 2020, I began to study macroeconomics in depth, which became part of my analysis process, using fundamentals in my analysis as well and keeping up with new technologies. This is how I identified opportunities in cryptocurrencies, recognizing a time when the macroeconomic scenario was favorable, blockchain was an emerging technology, and then I developed a portfolio strategy that had an edge in selecting cryptocurrencies. 

Nowadays, my strategy is focused on long/short in the US stock market, aiming to buy (long) the best stocks (usually large tech stocks with high growth potential, solid business moat, but also some excellent defensive stocks) or ETFs of the best sectors and sell (short) ETFs that have poor strategies and/or prospects.

Investor

Marcello Vieira - Investidor de Sucesso

I founded 'Successful Investor' while working full time as a doctor back in 2012, teaching people how to invest more effectively.

The strategies have evolved over time, but I only teach what I do with my own money.

We now have over 15,000 students learning about investments in crypto and stocks with the goal of achieving financial freedom.

Founder

Medical Doctor

The All-Weather Investor | Building a $5M portfolio—$1M already achieved | Sharing everything I learn along the way

Strategic stock investing for Wealth Managers and Family Offices.

Wealth preservation is essential. 

But true financial stewardship requires strategic growth—built on conviction, discipline, and risk management.

Many wealth managers and family offices struggle to find stock investment strategies that deliver superior returns without unnecessary complexity. Our approach bridges that gap.

I’m Marcello, a former doctor turned full-time investor with two decades of experience in stock and crypto markets. 

Since 2016, I have worked with wealth managers, family offices, and high-net-worth individuals to implement investment strategies that maximize performance while protecting capital.

In 2020 and 2021, my momentum-based approach transformed $32,000 into over $1 million. 

Today, we refine and apply that strategy for professionals seeking an edge in the markets.

What we offer: 

↳ Institutional-grade stock strategies designed for long-term performance
↳ Risk-managed investment frameworks to navigate uncertainty with confidence
↳ Tailored solutions for wealth managers and family offices seeking scalable, high-conviction strategies

If you're looking to strengthen your portfolio strategy with a proven, data-driven approach, email me at marcello@mdvinternational.com

Marcello Duarte Vieira

ZC Social Media - Zoe Cairns

Social Media Marketing / Social Media For Business / Social Media Trainer / Social Media Strategist / Social Media Speaker -Helping businesses to build their presence online with Social Media networking tools and share their knowledge and expertise to become an expert within their field. Specialising in Social Media Strategy Planning.

Social Media Training in Social Media Strategy, LinkedIn, Instagram, Facebook Marketing and Advertising, Twitter Marketing and Advertising, YouTube and Video Marketing - how to use these social media sites effectively, showing advanced strategies.

Offer training via hands on workshops, online programmes, 1 to 1 mentoring, hour consultations and programmes. We also offer bespoke Social Media Management.

Also put together their Social Media Strategic Plan - a plan for them to go forward and get the maximum from their Social Media activities.

Social Media Trainer / Social Media Speaker / Social Media Strategist / Director of ZC Social Media

The Credibility Formula

Helping speakers gain confidence, get paid gigs and become a thought leader.

Over the last 14 years, I’ve built two successful companies and have spoken in over 14 international countries, sharing my expertise with a growing community of over 100,000 people.

My mission is to help companies create engaging content, generate leads, and profit from social media, and empower speakers to gain confidence, secure paid gigs, and become thought leaders.

I’m the founder of ZC Social Media, where we specialise in social media strategy, content creation, and lead generation, and of The Credibility Formula, dedicated to helping speakers become professional speakers and recognised thought leaders.

My portfolio:

→ I'm the founder & CEO of ZC Social Media, a social media agency with a vibrant online community of over 100,000 people
→ I’m the founder & CEO of The Credibility Formula, where I coach speakers to build their confidence and secure paid speaking engagements
→ I offer bespoke 1-2-1 training and consultancy to help businesses and individuals master social media
→ I lead the ZC Social Media Growth Academy, a programme designed to help businesses grow their online presence
→ I am a published author, recognised as a Top Voice on LinkedIn, and have made appearances on BBC, ITV, and BBC World News to share my insights on social media and thought leadership
→ I’ve had the privilege of speaking for NATO, a top brand to work with, further establishing my credibility on the global stage

My results:

→ 100k+ online community
→ 14+ years as the owner of ZC Social Media Agency
→ Speaker at events in 14+ international countries
→ Published author and recognised thought leader
→ TV and radio appearances on BBC, ITV, and BBC World News, Sky News, Ch4 and KMTV

If you want to learn more about how I built this, you can join my newsletter and receive a free video on “How to Get More Speaking Gigs from LinkedIn”:

→ GO HERE: http://www.zcsocialmedia.com/newsletter

If you want to explore 1-2-1 training or consultancy, visit my personal site:

→ GO HERE: http://www.zcsocialmedia.com

If you want to join the ZC Social Media Growth Academy:

→ GO HERE: http://www.zcsocialmediaacademy.com

If you want to join The Credibility Formula to gain confidence, get paid gigs, and become a thought leader, DM me.

Instagram: @zcairns
Facebook: ZoeCairnsUK
Twitter: @zoe_cairns
YouTube: @ZoeCairns

Zoe Cairns

What a quarter it’s been. 

I’ve spent the past few months supporting clients and Growth Academy members as they prepare their 2026 plans, and it’s been brilliant to see ideas developing, strategies becoming clearer, and confidence growing as we approach the new year.

There are still a few planning sessions to work through over the next couple of weeks, but I’m already pleased with how everything is coming together. 

Watching businesses build structure, direction and momentum is exactly why I love doing what I do.

And now it’s my turn. 

Goals are set, and it’s time to move into the creation stage, taking what’s planned and beginning to build it out.

If you still need support or direction for your 2026 social media plan, feel free to send me a message.

To your successes, Zoe 💜

International Social Media Speaker and Trainer |Social Media Consultant | Social Media Strategist | BSc Hons

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Six weeks with an amazing team, it’s been brilliant working together.

I’ve been supporting the Hempstead House Hotel & Spa with their strategy and content plan across the different departments, and then guiding them through clear step-by-step processes on how to create content.

It’s been great seeing everything come together, watching the team grow, ask questions and talk openly about anything they needed support with. They’ve been a pleasure to work with.

I’m looking forward to seeing what they do next. Thank you Michael Wood FIH for the opportunity. 

#SocialMediaTraining #KentBusiness #AquaMandaSpa

AI isn’t replacing marketers, it’s changing how we work.

Some people worry that AI will replace marketing teams.

What I’m seeing feels quite different.

AI isn’t taking away the role of people… it’s simply changing how we work each day.

The businesses making real progress aren’t handing everything over to a tool. They’re the ones using AI to support the way they already plan and communicate.

→They still decide the message.
→They still shape the tone.
→They still guide the strategy.
AI just makes some of the tasks quicker.

Over the past few months, I’ve been looking at how teams use AI for things like planning, research, repurposing and keeping consistent.

One thing stands out more than anything: the process you put around it matters more than the tool itself.

AI becomes helpful when it’s part of a clear approach that already works.

I’ll be sharing more thoughts over the next few weeks on how AI can sit alongside your existing processes without changing your voice.

Do you feel that AI is helping or overwhelming at the moment?

#SocialMedia #AIForMarketing #MarketingStrategy

Community isn’t just a “nice to have”. It’s the heart of everything.

I’m often asked how we bring over 400 people together at ZC LIVE. 

Yes, we’re a social media agency, so we understand how to reach the right audience and speak to the challenges they’re facing. 

We create content, sessions and conversations that genuinely help people progress. 

When people feel supported, they show up.

But the real reason?

Community.

Over the years, I’ve been lucky to bring together people who stay connected, who talk about us, who introduce new faces, and who show up for each other. 

They bring the energy in the room, the conversations that continue long after the event closes, and the feeling that everyone is welcome. 

It’s the community that has shaped ZC LIVE into what it is today.

The same is true for the Growth Academy. 

Five and a half years of people learning together, sharing what they know, and encouraging one another. 

Watching this grow has been amazing and reminds me why I do what I do.

Community gives depth. 

It brings people together who might never have crossed paths. 

It turns events into experiences. It turns learning into progress.

So here’s my reminder to pause and appreciate the people around you. 

If you run a business, how are you bringing your community together? How are you nurturing it so it continues to grow?

To everyone who has been part of ours, thank you. 

You make everything worthwhile 💜 

To your successes, Zoe

One word from each person… and the energy in the room said the rest.

Today’s social media plans workshop was such a good session to run. 

Everyone came in wanting direction and left feeling far more organised, clearer on what they need to do next, and ready to put their plans into action. 

It’s amazing what happens when you take the time to map things out properly instead of trying to guess your way through it.

Thank you to all of the growth academy members that attended today! You are such a pleasure to work with! It’s been such a fabulous day!

If you want support, ideas and a space to build your social media with confidence, the Growth Academy is always open.

Hanna Longstaff Angus Fraser Terri Cliffe-Harrison Tawa Dowling Fiona Shoults Medical Tattooist Sarah Grant Michelle O'Brien Angel Thomas Dr Ant Webb Clare Wilders Joanne Slaughter Jude Hill Paul Wren Darren Woolway Youssouf Ouattara Adama Bridgewood Manor Hotel & Spa  

#growthacademy #socialmediaplan #socialmediastrategy

AI tools are everywhere right now.

But without structure, they can easily make things feel more complicated than before.

I speak to so many teams who sign up for the newest platform, hoping it’ll save them time…

And within a few weeks, they’re back where they started.

→Too many tools.
→Too many tabs.
→No real change in workload.

The truth is, the tool is rarely the problem.

It’s that there isn’t a simple workflow holding everything together.

When you’re content planning, creation and repurposing follow a clear rhythm, AI finally starts to help rather than overwhelm.

It fits into the way you already work instead of pulling you in a new direction.

One of the best places to begin is surprisingly low-tech.

Before you decide which AI tools to use, spend a few days looking at what you already do.

Here’s a tip for the week ahead:
→Write down every digital task you complete each day — content planning, research, drafting, admin, editing, posting, reporting.

At the end of the week, colour code them under three headings:
→tasks you could delegate
→tasks an AI tool could support
→tasks that truly need you

Most people are surprised by what they uncover.

They spot patterns.
They see where time is disappearing.
And they realise that AI doesn’t need to replace everything, it just needs to support the right areas.

Start there.

Small steps, clear categories, and a better picture of where AI genuinely helps.

It’s one of the simplest ways to build a workflow that actually works for you.

Have you ever mapped your tasks like this before?

#SocialMedia #AIForMarketing #ContentStrategy

It was lovely to meet with Carol Ford, WeAreMedway, yesterday at The Waterfront Restaurant and Tavern to chat about all things Medway.

Some great ideas and a new project set!

Looking forward to sharing with everyone.

It was great to see you Megan Morley.

I love your video! Thank you for capturing the day. So pleased you enjoyed it!

Marketing & Communications Coordinator for Conferences and Events at the University of Kent

I had the pleasure of attending ZC Live 2025 last week with my lovely colleagues Ana and Phil.

It was a day full of learning, connecting and feeling inspired to get creative with social media. I loved being in a room with some faces I haven't seen in years and connecting with new people throughout the day.

Thank you to Zoe Cairns and the amazing ZC Social Media - Zoe Cairns team for organising such a great event. I'd also like to thank the speakers for sharing their knowledge on the day - Zoe Cairns, Molly 'Moodle' Smith, Yannick Weinberger, Susie Warran-Smith CBE, Rachael Bryant, Ben Bryant, Dr Tim Aker, María José Serrano Carbajal, and Mark Jennings.

Here are some key takeaways from the event:
- Using trial reels on Instagram can help get your content in front of a new audience and expand your reach.
- Exploring the 'People also ask' section in Google can help you generate video ideas and create relevant FAQs for your audience.
- Adding captions to your reel within the platform will help with search.
- Repurposing your video content into multiple formats will give you a library of relevant content to use i.e. carousels, blogs, snippets and more.
- Consistency across your brand, tone and content is key.
- Utilising creator insights on TikTok can help you find relevant trends for your niche.

Looking forward to putting these tips into action and trialling new content. Watch this space 👀 

#ZCLive2025 #ZCLive #SocialMedia

taplio

The Battle

Marcello Duarte Vieira

Zoe Cairns

Followers

Posts

Engagements

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Performance ScoreZoe Cairns's LinkedIn Performance

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The Battle

Marcello Duarte Vieira

Zoe Cairns

Followers

Posts

Engagements

Likes

Performance Score.css-goub6s{font-size:var(--chakra-fontSizes-md);font-weight:500;color:var(--chakra-colors-gray-600);display:block;margin-top:var(--chakra-space-1);}Zoe Cairns's LinkedIn Performance

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Performance ScoreZoe Cairns's LinkedIn Performance