Earlier today, a friend of mine tried logging in to his account on my computer, but no matter what we did we got into my account instead. He's using a Technorati account, we got to the page and everything, logged in, but at Stack Overflow we ended up on mine.
I cleared all cookies and everything, but now I can't log in to my account instead. I use a Google account. When I try to login, I get to the Gmail login, I enter my mail and password, and get back to Stack Overflow which recognizes it as a new one. I tried logging in again, this time I don't get the gmail login. Instead, Stack Overflow immediately recognizes it as a new one. If I clear all cookies and try to login using Google, I get to the Gmail login again, but still same thing. I tried creating a new account when it asked if I'm a new user, and as expected I get a new account, 1 rep, and "unknown" as name.
What do I do?