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The Strange New Ritual That Quietly Rewires Your Investing Brain
Something peculiar happens the moment you tell fifty thousand strangers what you believe about a stock. The belief stops being yours and starts being your reputation. There is a strange new ritual in modern investing. A person finds a company they like, builds a model, writes up their reasoning, and then, instead of quietly buying shares and going about their life, they post the entire thing on Twitter. Sometimes it arrives as a thread with twenty posts. Sometimes it is a screenshot of a spreadsheet. Sometimes it is just a ticker symbol and a rocket emoji.
The question almost nobody pauses to ask is whether this act of publishing changes the thesis itself. Not the stock. Not the market. The thinking behind it. This is where confirmation bias in investing stops being an abstract textbook idea and becomes a daily psychological trap that costs people real money. The old fashioned value investors, the ones who read footnotes and annual reports the way other people read novels, have a quiet answer to this. It is not the answer the internet wants to hear, and it is supported by decades of research in behavioral finance.
When you understand the psychology of public commitment, you begin to see why the loudest voices on financial social media are often the most trapped. They have unknowingly engineered their own inability to change their minds. This article walks through exactly how that happens, what the research shows, and how to protect the fragile private space where genuine reasoning still lives.
What an Investment Thesis Actually Is
Before reaching the psychology, it helps to understand what an investment thesis genuinely is. It is a specific argument that says: here is a business, here is what it is worth, here is why the market has priced it wrong, and here is what would have to happen for me to change my mind.
That final clause is the one almost everyone forgets. A real thesis includes the conditions under which it dies. It is an argument that has been pre scheduled for its own funeral if the facts eventually turn against it. A thesis without those exit conditions is not analysis. It is hope wearing a spreadsheet as a costume.
This is precisely why serious value investors have historically been private about their work. They are not secretive for the sake of mystery. They are private because thinking is a fragile activity, and the instant you attach an audience to it, something subtle begins to shift.
The thesis stops being a tool for understanding a business. It quietly becomes a tool for managing how you appear to other people. Those are two completely different projects, and only one of them makes you money.
The Anchoring Problem Hiding Inside Every Public Statement
Behavioral finance has a name for the first force at work here. It is called anchoring. Once a number, a price target, or a conclusion enters your mind, it becomes a reference point that distorts every judgement you make afterward. Daniel Kahneman and Amos Tversky demonstrated this repeatedly in their foundational research. People asked to estimate a value after seeing a random number anchored their estimates toward that number, even when they knew it was arbitrary.
Now consider what publishing a price target does. You have not simply set an anchor in your own head. You have carved it into stone in front of an audience. When the business deteriorates and the evidence says the fair value should be cut in half, the original anchor pulls against you with the added weight of public memory. The stock has changed. The facts have changed. Your anchor, reinforced by hundreds of replies and retweets, has not.
How Public Commitment Turns Belief Into Identity
The second force is the most powerful one, and it has the most research behind it. Psychologists call it the commitment and consistency bias. Robert Cialdini documented it across decades of work. Once a person takes a stand publicly, an almost mechanical pressure arises to behave consistently with that stand, even when consistency works against their own interest.
The classic demonstrations are striking. In one well known field study, researchers asked homeowners to place a small sign in their window supporting safe driving. Weeks later, those same homeowners were far more willing to allow an enormous, ugly billboard on their front lawn than neighbours who had never made the small initial commitment. The first small public act reshaped how people saw themselves, and they then acted to stay consistent with that new identity.
Apply this to investing and the danger becomes obvious. Once you say something out loud, in front of others, defending that statement becomes tangled up with defending yourself. The belief and the ego fuse into a single object. Changing your mind stops feeling like learning and starts feeling like losing.
What Social Media Does to Your Reasoning
The problem is not that financial Twitter is mean, although it often is. The deeper problem is that it functions as a theater, and theaters have audiences, and audiences alter the performance whether the performer realizes it or not.
You begin writing for applause. You start omitting the parts that make you appear uncertain, because uncertainty does not get retweeted. You smooth over the ugly edges of your reasoning, the places where you genuinely do not know something, because admitting that feels like handing ammunition to critics. What began as an attempt to understand a business has quietly become an attempt to win an argument.
Social Proof and the Crowd Around Your Position
A third behavioral force enters once an audience gathers. It is called social proof. When other people agree with you publicly, their agreement becomes evidence in your own mind that you must be correct, regardless of whether the underlying business has improved at all.
Cialdini described social proof as the tendency to view a behaviour or belief as more valid when others around us hold it. In investing, this manifests as a feedback loop that is almost engineered to destroy independent judgement. You post a thesis. Followers who already liked the stock pile into the replies with agreement. Their agreement feels like validation. The validation strengthens your commitment. The strengthened commitment makes you even less able to process the quarterly report that quietly contradicts everything.
This is the precise mechanism behind so many crowded trades that unravel violently. Everyone has anchored to the same target, everyone has publicly committed, and everyone is mutually reinforcing everyone else through social proof. When the facts finally break the consensus, the reversal is brutal because thousands of people delayed their updates at exactly the same time.
Sharpening Versus Self Defence
People who publish theses have a reasonable response to all of this. They argue that writing in public forces them to be clearer, that pushback from strangers sharpens their thinking, and that explaining an idea to an audience exposes the parts they did not fully understand.
All of this contains truth, and all of it misses the point. Writing clearly is genuinely valuable. However, you can write with total clarity in a private document, a letter to a trusted friend, or a journal that nobody else will ever read. The clarity comes from the act of writing, not from the act of publishing. The audience is not a necessary ingredient. The audience is merely the ingredient that also drags along the ego, the theatrics, the need to appear right, and the slow corrosion of your ability to update.
As for sharpening your thinking through pushback, this only holds when the pushback is high quality. On social media it mostly is not. What you receive instead is a flood of people who did not read past the first post, people arguing against a caricature of your idea, and people who simply want a fight because they are bored. Separating signal from noise consumes more energy than you would have spent thinking carefully on your own.
Why the Best Investors Stay Quiet
Ask Warren Buffett why he does not tweet his positions in real time and he will probably laugh. Ask Seth Klarman, Howard Marks, or any of the serious old guard, and the answer will be a version of the same idea: the moment you tell everyone what you believe, you have made it harder to think clearly about it afterward.
This has very little to do with hiding ideas from competitors. Most value investors happily discuss their reasoning years after the fact. It has everything to do with protecting the private space where doubt is still permitted to exist. Charlie Munger spent the majority of his life reading in a chair rather than broadcasting opinions to strangers. He understood that attention is a finite resource, and that attention spent defending your public image is attention you are no longer spending on the actual business.
The One Form of Public Writing That Works
There is a single version of public writing that genuinely seems to help, and it deserves naming because it is the exception that proves the entire rule. It is the long form, slow, retrospective write up. The kind where an investor describes a position they entered a year ago, explains what they were thinking, and honestly catalogues what they got right and what they got wrong.
This works because the thinking is already finished. The thesis has already survived or already failed out in the real world. There is no live ego at stake, because the outcome is largely known. The writing becomes a teaching tool rather than a performance, and crucially, none of the three behavioral forces have anything left to corrupt. There is no anchor to defend, no live commitment to stay consistent with, and no social proof loop pushing you away from an update you still need to make.
Notice how completely this inverts the real time thread. It is slow rather than fast. It is retrospective rather than live. It is written to teach rather than to impress. The honest retrospective is one of the most valuable documents in all of investing precisely because it removes every psychological force that ruins live commentary.
How to Protect Yourself in Practice
If you want the clarity of writing without the psychological cost of public commitment, several habits help enormously.
- Write the thesis privately first. Capture your reasoning, your valuation, and your exit conditions in a document only you will read. The clarity arrives during writing, not during posting.
- Define your falsification conditions before you buy. Specify in advance exactly what evidence would prove you wrong. Anchoring loses much of its power when you have already named the moment you must abandon the anchor.
- Keep a private decision journal. Record what you believed and why, with dates. Reviewing it later shows you how often you actually update, which trains honesty far better than any audience can.
- Treat public commitment as a cost, not a feature. If you must post, recognize that you are taking on a consistency tax and a social proof loop. Post the lesson after the fact, not the live conviction.
- Notice when you feel defensive in the replies. That feeling is the alarm bell. It signals that your ego has fused with your thesis and your judgement is now compromised.
The Quiet Conclusion
So does publishing your investment thesis on social media make it better or worse? The behavioral finance answer is that it almost certainly makes it worse, and the reason has nothing to do with secrecy and everything to do with psychology. Publishing transforms a private act of reasoning into a public performance, and performances obey their own logic that has nothing to do with being right. Anchoring locks in your numbers. The commitment and consistency bias welds your conclusion to your identity. Social proof surrounds you with applause that feels like evidence.
The strange part is that most people who post their theses sense this on some level. They can feel themselves growing defensive in the replies. They notice themselves doubling down when they should be backing off. They can detect the pull of the audience shaping what they say and eventually what they believe. They simply cannot stop, because the attention feels good and quitting would look like losing.
This is the part the old value investors understood that each new generation keeps rediscovering the hard way. The finest investing is done in a quiet room, by a person who has made a private deal with themselves that the truth about the business matters more than the truth about how they appear. Social media is many things, but it is never a quiet room.
The people who figure this out, usually after a few painful public reversals, tend to follow the same path. They stop posting the thesis. They start posting the lesson. Then, eventually, they go quiet altogether, because they have remembered what they were attempting to do in the first place. They were trying to think. It turns out that thinking remains a private activity, no matter how loud the timeline becomes.
