Sometimes things just get ingrained as impulse and habit. I tried a lot of things before finally deactivating Facebook. Downgraded to a dumbphone briefly but it just wasn't feasible with work - especially the hotspot for when I'm on call. Tried scheduled site blockers like Freedom.io but the problem is I know how they all work so it was easy enough for me to disable them for a second. Tried blocking news sources that were usually associated with political-rant-shares but the algorithm just keeps roping you back in.
I generally try to stay off the web after work unless there's something I NEED to do after hours (right now I'm just finishing a database upgrade) and that easy enough. Killing Facebook ended up being the real cure for me. Any other sites I check I'm generally done after about 15 minutes...for the day. Facebook is just constant though. It's just such an easy go-to. Like the author of this post, I find myself reading books a lot more (for a really interesting read, check out The Undoing Project btw).
I see some other comments on here being critical of the decision but the real key is just identifying an acknowledging when you have a real, legitimate time sink problem. When you do and you can get to the bottom of it, it's like a weight off of your shoulders. Some people are better at moderation than others. Others are much better at quitting cold turkey.
When you really identify how much time you're wasting per day / week of something that's in short supply, especially when there are things you keep wishing you could find time for...the decision to do something like this gets really...really easy.
And once you do it, it feels pretty great.