One of Facebook's most dangerous and unique thing is their algorithm. It essentially recommends you things that it predicts you would like and tries to keep you engaged and it can be super addicting. It's sort of scary thinking about how if you'd let a kid grow up completely on facebook and youtube with their algorithms, they'd probably have a serious addiction to it similar to that of a drug addict.

I certainly don't think online games can exactly make you anti-social. But I think games can be equally as damaging and have the ability to definitely make people isolate themselves and anti-social. Sexual harassments, hate speech, and many other bad things are amplified in online video games and having a person doing most of their socializing in these environments could lead to isolation and being anti-social. This is super debatable, but basically my thought process is if I had my kid grow up purely on games that have a toxic audience (ex. CS:GO or like most FPS games, not trying to hate) without any real social interactions, i'd feel like no one in the real world would want to talk to them due to them developing terrible and toxic social skills and in turn isolates them.