I don't like the idea of a thumbs down or dislike button. Too clutters in the feeds, and too apt to be used to be grumpy annoying... If you want to disagree, or have an issue with something, you should have to make the effort to actually reply, and do it appropriately. It's not like a comments thread under news where you vote up or down, and maybe the really down voted ones get hidden or whatnot - as a form of moderation. that's not really something that would make sense on a forum.
HOWEVER...
I wish the "like" button was a "thanks" button instead.
As in, "thanks for posting".
Cause sometimes I'm going to hit the like button because I'm glad someone posted something, or just want to acknowledge that I read it and appreciate it, but then I realize I might be making it sound like I'm liking something bad that happened or something like that.
Another thing I don't like is that you can like threads from like 10 years ago, and they show up in "news feeds".
You see a like in your friends feed, and click on it to find they're liking something from 2003 that has nothing to do with anything today.
I'm not saying I don't think people should be able to like posts from 5 or 10 years ago. I think they should be able to like stuff from 10 years ago.
I just think likes on posts that are say more than 5 years old, shouldn't maybe belong in the news feed.
Just sayin'.