Your service sounds awfully lot like Stack Overflow/Stack Exchange, which seems to work just fine without the need to "verify" users or require users to login via Facebook. Why does your service need it? Also, I have no desire for a site (yours or otherwise) to take my picture and friend list from Facebook, and it's a little presumptuous for Quora to require me to provide this information.
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Your service sounds awfully lot like Stack Overflow/Stack Exchange, which seems to work just fine without the need to "verify" users or require users to login via Facebook. Why does your service need it? Also, I have no desire for a site (yours or otherwise) to take my picture and friend list from Facebook, and it's a little presumptuous for Quora to require me to provide this information.
Also, what's the main diff between this and Stack Exchange other than that this is all-purpose? Are you gonna let search engines index answers?