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Add-on Multiple accounts

#1
Aside from shared IPs and alter ego cookie detector, Im wondering if it has ever been considered or if there is an add-on that determines if two users have precarious log-in times. Like one often logs in shortly after the other logs out, or that they never login and are active at the same time. Obviously this could be bypassed by having two devices, but could be useful in further detecting users with multiple personalities.