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I could be wrong but I'm 99% sure you can't just search an individual by logging in.

• mikeash 11y ago
  But how many people know that ahead of time?
• Nicholas_C 11y ago
  Or they're searching within a general proximity of their location just to see who's on.
• throwaway7767 11y ago
  But there's only one way to be completely sure, right? And that's probably the source of a lot of these signups.