I'm actively present on 3 platforms. Here are the stats:
Twitter. Blocked by: 0. Block: 0.
Github. Blocked by: 1 (actually kind of 2). Block: 0....
For further actions, you may consider blocking this person and/or reporting abuse
I block people on Twitter. I have a large blocklist there because I started off with someone else's and imported it: a few thousand people who are just trolls and spammers.
Twitter's a trolly and spammy place.
I block a bunch of idiots on Quora, mostly because there's no dashboard or anything where you can find out who you block or who blocks you, so whenever I find myself blocked, I knee-jerk block back, so that I don't have to interact with the person again in any way that could end up frustrating me when I go to comment.
I didn't know you could block (or interact in any way with) people on Github. TIL.
I liberally block on the fediverse; I conservatively block on chat (IRC, talkers).
I would block or mute people on Dev.to if I could. I'd prefer to organise it so that I saw content by everyone apart from the people I don't enjoy, if that makes sense, rather than outright block them. Especially as the main reason I want to block people here isn't because they're fundamentally unsavoury people. Positive filtering is nicer.
I probably use other platforms, but I can't think of them right now. Whatever else I'm on, I have too few interactions for it to be worthwhile.
I was blocked by a kid actor when he tweeted shaming another actor and I replied “not cool” 😂
I think that’s my only one, but I started blocking a lot of celebrities and politicians ever since twitter saw it fit to show the tweets of people I don’t follow on my TL.
I treat social media blocklisting like I do security. Start from the most restricted stance, then open up gradually. So, for instance...
Facebook: Most of my stuff is posted only to Friends. I don't even allow Friends of Friends. That said, there are a few things I post publicly. Even with these restrictions, I don't use Facebook much.
Twitter: I don't use it. It's a cesspool.
Instagram: My account is set to private. I only follow people who I also have direct contact with on a regular basis IRL. And I only allow people I know IRL to follow me. That way, I know what's really going on with them (not what they want me to think they're doing) and can act accordingly. I never hesitate to cut someone off if they start drama.
LinkedIn: I only use it for business connections. And I rarely look at the timeline of posts from people I'm connected with. I don't use it as a social network, to be honest.