Algorithm isn't that. It's not just a block.

I don't think anyone here did create anything like that that isn't some simple formula that accounts for number of likes, date & number of comments, converts that to a single number and sort by that. Plus, there is a way to sort differently in many ways.

Algorithm will not completely prevent you from being in the feed. But your visibility drops thousandfold. Posts that previously would get thousands of likes get 20 views.

Same way they create popular political figures and newsfeeds out of nowhere. Just ramp visibility in the algorithm to the target groups.

Algorithm is a blackbox that is unpredictable to the end user by design. The idea is that algorithm learns what you like to read, what are you interacting with, so it feeds you the content to keep you engaged to the max. The parameters by which you see some post but not the other are not decided by some clear sorting rule. Each user would have lots of hidden values which impact the sort order.

While being generally useful (despite the hate, people love to be engaged with content they like to see), people also don't notice that they are being fed/denied some content because they are used to their feed being a black box.