Back when I made fake people up my forum, I didn't always keep them there. Sometimes I posted as them on other forums, mostly that was rarely. But once I decided to use one account a lot on another forum. The admin found out and told me when I was saying something on a thread.
She said it was the same IP address, which I hadn't thought about! So the other forums I was on, they probably noticed there too. I felt so embarrassed. I had to leave that site where I was found out.