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I'll start following people whenever I feel like my feed needs some fresh blood. I'll usually find a post with some good discussion in it and follow the people on there that I'm not already. My only criteria is that their comments are well composed, thoughtful - ahem, and nice. If someone can bring out their personality in their writing within a few paragraphs then I'm generally happy. I don't really get hung up on the decision of who to follow or not. If someone muddies my feed, then I'll kick'em to the curb.