That is easy enough to confirm-The site moderators can verify the IP address of all logins. The Internet Protocol is like a fingerprint from the computer your are using-While dial-up still uses a variable IP, I believe DSL and cable use static IP addresses from the usesrs computer. (please correct me if i am wrong).
The site mods can look at the two logins check the IP and see if it is the same user under a different name or alias.
We forgot that most everything we do electronically leaves a trail, and btw, when you delete something? its really never gone
Just my humble two cents for today,
Scorp