I like Mefi, but only for the Ask section. The lack of threaded comments makes it hard to have a discussion, so all the negatives associated with point-by-point debate (trolling, fanboi-ism) go away. On the other hand, the discussion is never really that interesting, except when someone writes an interesting story.

The rest of Mefi doesn't really interest me. I occasionally look at the front page, but it seems like it's a site for English majors that want to argue about typefaces. For technology-related stuff, news.yc meets my needs.

For random internet humor, I read the comments section in programming.reddit. There is some hilarious stuff there. It's sad that in a year or two, those commenters will be here :(