Jeff seems to have this in hand, but I feel that a few words should be taken to clarify the issue.
The forum lets us see where every user signed up from or access the forum from via IP capture. This is a built in security feature of the software as it lets us find attacks that are coming from a single location, and shut them down. Very hand with bot nets and such that mass subscribe to the forum to post spam. But it also lets us see each users unique active location.
For example:
VivianLove: 166.137.125.48
Writer_LiamBond: 166.137.125.48
Both of these two accounts that I have happened to use the forum from the exact same IPS location. To the 4th place. Which means the exact same device, if it was mobile, or wired connection if not.
166.137.118.18 : mobile-166-137-118-018.mycingular.net
Oh look. It's a cell phone. And as a cell ISP designation it's unique. It belongs to one and only one device.
So perhaps the two users share a cell phone. Or perhaps one person has two accounts.
I'll let all the readers decide which they want to believe.
Myriads