Proof by anecdote
https://www.frontiersin.org/articles/10.3389/fpsyg.2019.0271...
https://bmcresnotes.biomedcentral.com/articles/10.1186/s1310...
https://hbr.org/2017/04/a-new-more-rigorous-study-confirms-t...
Facebook's own research: https://www.theverge.com/2021/9/29/22701445/facebook-instagr...
It's nice - and of course timely - that there are some heartwarming feel good stories in this thread.
But the plural of anecdote is not science. And the science is pretty damning.
I'm not saying that FB and this huge corporate capture of the internet is _good_, but making arguments like this doesn't actually make coherent sense.
[1]: https://buddingpsychologists.org/binge-watching-mental-healt... (I didn't read the article, but I did skim the referenced papers)
If the proposition is "Facebook brings at least some good to the world". A single confirmed anecdote of Facebook bringing a single good thing to the world is a proof. In the same way that all you need to prove that black sheep exist is to show a single black sheep.
The proposition is "Facebook brings a lot of good to the world" is a bit trickier, we need to define "a lot", but it can still be proven by "a lot" of anecdotes.
It is not a generality we are trying to prove, so we don't need to have data representative of the general case.
The part about Facebook being the best for dating is stated as a personal opinion.
No one is doing large scales studies of how many people meet their partner on FB, so anecdote is all we have for that.
Most of the criticisms are also anecdotes, but you seem fine with those.