Reddit is the trickiest beast of them all. Not necessarily "social" media, but I have also blocked Reddit. I've had many accounts over the years, and it used to be a great site. But its become heavily moderated, politicised, toxic, advertising heavy. I really question if even half of the posts are genuine people posting (probably not).

I have a url blacklisting extension and I block reddit entirely, it wont even come up in google searches etc.

I think Reddit is one of the hardest to break from though. I've been completely off it for just over a month. I replaced it with HackerNews