> It is weird seeing your post with only 1 tag.

It was an accident :) For some reason, the other tags didn't hold.

>I know that you can pay to make your posts more visible. But I did not imagine that people are doing this enough to keep platforms alive.

Advertising revenue. around 98% of Facebook and 85% of Google income is through paid advertising. They can charge so much because they can granularly identify and then target individuals and user groups easily. And as we have seen, swing elections whichever way they get paid to swing.