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Asymmetric follow is why I use Twitter regularly and Facebook much less often. With Twitter’s model, I can find people I’m interested in, whether or not they know me, and learn about them and their lives and thoughts. Others can include me in their lists. You become “friends” with complete strangers over time, by communicating with them (responding with @messages for example), perhaps by mutual following.

Twitter’s wonderful system of @ messages means that anyone can address me - and so I find myself having conversations with complete strangers as well. I actually follow my @ messages more faithfully than I do my planned Follow list.

On Facebook, I’m expected to approve every request, and alas, I turn down far more than I accept. Amazingly, few people who I don’t know even bother to explain who they are and why they want to be my friend.