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As the title states, I found both users involved in the same question.

Is this a byproduct of not entering an e-mail address combined with random coincidence? Have I stumbled upon a situation of possible future collusion?

There is little evidence to go on at this point (both seem to be involved in roughly the same subject area, but both have < 20 rep), so maybe this is just something to keep tabs on.

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If they have no given email and the same IP the gravatars will be identical. – alex Feb 28 '10 at 8:00
    
Not colleagues I hope, given both were online during the last hours, on Sunday ;-) – Arjan Feb 28 '10 at 10:02
up vote 4 down vote accepted

Neither has an e-mail, and they share an IP - but there is no inappropriate activity between the accounts. They might be the same person, or they might be friends / colleagues. Who knows? Let them be, I reckon...

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And two different names, whatever that means, so I guess it's not about forgetting an earlier login either. (Dave and Prabakar) – Arjan Feb 28 '10 at 9:26
    
@Arjan - indeed; they're both registered accounts. – Marc Gravell Feb 28 '10 at 9:45
    
Just in case someone wonders where I saw the names: I meant to say they use different names below their posts. Like stackoverflow.com/questions/1751315/… and stackoverflow.com/questions/2348897/… – Arjan Feb 28 '10 at 9:55
    
Marc correct me if I'm wrong but the official policy is that sock puppets are allowed as long as you don't upvote yourself (or similar), right? – Andreas Bonini Feb 28 '10 at 11:10
    
@Koper - I'm not sure about official but that sounds reasonable. Same reason not to have a flagging-user function. It's not about the users, it's their behavior that can be inappropriate. – Robert Cartaino Feb 28 '10 at 13:30
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I believe that sock puppets are verbally discouraged for any purpose, but action won't be taken unless you causing trouble or trying to cheat. In any case I think we need enough policy flexibility for people to maintain accounts for (say) observing the new user experience. – dmckee Feb 28 '10 at 17:16
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I don't think we should tolerate sock puppets ever -- if someone wants to have one for a legitimate research purpose, they should have to clear it with the moderators explicitly. – Ether Feb 28 '10 at 17:59
    
Thanks, Marc. I'll take a peek at this periodically. – Jon Seigel Feb 28 '10 at 19:12

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