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Users upload pictures of themselves, which are cross referenced through the database with facial recognition software. When a similar face is found, both parties are alerted about their newfound double. Now those born without an identical twin can have all the fun and games of messing with peoples'
minds through impersonation.
This could either be a standalone social networking website, or simply added functionality for already established sites.
Doppelganger Search System
Another variant of the same idea [Wrongfellow, Jan 02 2010]
||[+] The best part would be the ability to schedule look-alike flashmobs where a bunch of people suddenly show up looking alike, wearing the same outfits, and performing the same bizarre behavior.
||You all look the same to us.
||This might be bakeable as a Facebook app, since the critical mass of users is already there.