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I've never participated in one. I can't comment. EDIT: So a little clarification. I suppose that a Non-Disclosure Agreement is technically "invite based." However, I think there's a distinction there. The other thing to keep in mind is that technical communities have a reason to exist other than "shooting the shit" although that often becomes part of the fun. So I'm not really sure how to answer this question. On the one hand, I feel like I've never participated in one. On the other hand, the ones I've participated in are locked down tighter than The Illuminati but they don't feel invite-based (despite the 22-part web form I needed to fill out for one of them). I need a vacation.