Extremeskins: Almost 20 years ago, this site coined the term, "PALOFFS IS NOW!" so I'll always be indebted to the depth ES has added to my life.
Facebook: I joined Facebook the summer of 2004 when it was limited to .edu email addresses. I didn't use it super actively (maybe 2-3x a week) until I was in Japan for work for like 3 weeks in 2008. I was just accepting whatever friend requests came along but then I realized there were like 200 people I knew on it. I was pretty active on it until the 2016 election, when I realized how destructive it was. I still login 1-2x a month, but I went through and manually deleted every single like, post, comment, etc.
Instagram: This is the only social media I actively use. And yes, I know I'm a hypocrite here, because Instagram is owned by Facebook.
TikTok: I joined bc of my niece, but I deleted it. This is basically like ADHD in app form. I'm told this is where all the cool kids hang out these days.
Snapchat: I joined bc of my niece, but I also deleted it.
LinkedIn: I'm on it and I keep it updated, but I try to avoid it. I'm lucky enough to be relatively successful in my career, but some of the people who are active there are straight up sociopaths-- people who are barely out of college and declare themselves thought leaders, etc.
Reddit: This place used to be really good for finding people to talk about detailed topics. It still is, but it's gotten insanely popular in the past few years and it's hard to filter out the good stuff from all the noise. Also, there's a lot of promoted subreddits that are really just rage-bait (i.e.: subreddits that feature nothing but people acting like complete jerks in public).
X (Twitter): I quit the day Elon said he was buying it. This was another one where I deleted all of my tweets and likes. In general, I try to maintain a limited history on any social media. It's a shame because the original twitter was probably my favorite social networking platform, and it slowly devolved into a complete cesspool.
Other-Myspace: I was on MySpace for a while in the mid-2000s. It was really weird because there was a cultural split at the time between people who went to college (who joined Facebook) and people who didn't (who joined MySpace). Even though Facebook started allowing non-.edu emails, the reputations were already set, and Facebook spent a while trying to overcome MySpace's success.
Other-Classmates.com: LOL
Other-AdultFriendFinder: No Comment