Why your feed seems to know you inside out

You mention a subject in passing, you think about it without even searching for it, and shortly afterwards a video on exactly that subject turns up in your feed. The feeling is strange, almost intimate: you feel you've been guessed. And the first reflex is nearly always the same, suspecting the phone's microphone. Before going that far, there are far more ordinary explanations, and they usually account for the discomfort on their own.

We remember the hits, never the rest

A feed shows you a huge amount, and the vast majority doesn't concern you: you scroll past without even registering it. Then comes the one that lands dead on, and that one you remember - you even tell someone about it. So the tally is skewed from the outset: the misses leave no trace, the coincidences do. It's the same mechanism as the name you think of just before that person calls: you only keep the times it worked.

A portrait made of gestures, not secrets

What these apps lean on is nothing mysterious: what you watch to the end, what you replay, what your thumb slows down on a moment too long. You don't need to type a search to give a lot away; hesitating is already enough. Add to that the fact that you're not alone: people who watch roughly the same things as you, around you or on the other side of the world, trace a ready-made path - what they liked ends up being offered to you. A lot of "how did it know?" comes down to that: you share a habit with people you've never met.

Feeling seen isn't being understood

The most interesting part is left: a feed doesn't need to know you to give you the impression that it does. It just has to aim broadly enough - a worry almost everyone has had, a joke about an everyday situation, advice that could be addressed to anyone. You recognise your own life in it because you supply the details yourself. And above all, the picture a feed reflects isn't what you like, it's what you stop on - two very different things, especially late at night. The good news is that this mirror can be corrected: what you open, finish and genuinely search for weighs more than what you merely sit through. If you don't like it, it won't change by being stared at, but by changing what you feed it.