I don't know. I guess part of it is just you do what you feel is good, and you watch yourself to make sure you don't trip up. I'm probably not the best example: I unfriended every Facebook user that said they liked the book Twilight, and when I remove friends to prune my list it's always people who like Donnie Darko and Across the Universe. But that's something that I'd imagine every person comes across: it's natural to exclude people. That's not just something hipsters do. It's just that they're the ones with the most annoying tagalongs right now.