I remember that I used to have issues with providing (or receiving) too much RL private information. It was born out of a general desire to keep my real life and my online world compartmentalized, having seen early some bad examples of people who'd lost all perspective. With time I stopped being too worried about it, though. Which is not to say I tend to be awfully forthcoming, but I don't shut down conversations about these things anymore, either.
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I don't really care. My e-mail address does contain half my name, sort of. (Its written backwards and missing one part.)
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I'm indifferent to people knowing my social statuses, too.
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I can count the number of times I've shared a picture of myself on one hand. I don't think I've ever asked for someone else's picture. I've only video chatted with one person that I met through RP, and only a couple of times at that. I've never met anyone in person from RP (though I also live off the beaten path as far as RPer hot-spots go). I do voice-chat sometimes, though.
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People can have my e-mail address if they need it.
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I don't care if people know who I am on games. I listed my alts a while back on MSB, though I haven't updated that in a while (I haven't been RPing for a goodly long while now for various reasons). Admittedly I haven't always lived up to my own standards on behavior in the past, and it is an easy temptation to simply shed your old skin and try on a fresh and new one. But ultimately I prefer to just own it, good or bad. Not to say that reason to wish privacy is why everybody (or a majority, or many at all) might want privacy of alts, but that's where I get my occasional temptations. Mind, I do often like starting a game as an unknown - its harder to grab scenes or become involved in rp, but it also offers opportunities to break old patterns and forge some fresh new stories and learn some new perspectives. But I never really try to pretend to not be me, so much as avoid announcing it loud at the start.
Anyway, tldr; eh.