Re: What exactly does being a "friend" get you?
Well, it allows you to pm a whole bunch of people at a time.
Basically, I'm in it for the MySpace-iness of it all. But also, I have been using it to reach out to people with whom I've had some contact but would welcome more, particularly posters who might feel a little disenfranchised for various reasons, and it has led to some PM's from people who had questions but felt, perhaps, that I didn't want to be bothered. Now they know it's okay.
It's certainly not required.
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