It shows the viewer their deepest desires. And many have wasted their life away staring into what could be, but making no move away from the mirror to pursue any sense of happiness in reality.
There's a reason I deleted my reddit and Facebook and never had a twitter. You're not going to have genuine conversations and experiences there if your goal is "socializing" these days. Or at least, the genuine ones are outflooded by engagement bait.
This will certainly not be offered by capital, though.
As an example, you wouldn't even find a place like HN unless you are a particular kind of person or looking a a particular type of news. And I wouldn't even say HN is "hidden" per se. But it has kept its site counter to many other social media trends over the years. Those choices will build a different culture from Instagram or Tiktok.
Shocking? Hell this is half of the value social media provides capital: distracting the population with a hall of mirrors while offering precisely zero paths to a better future.