If you have old user accounts on forums, web based chat rooms etc when you are no longer using them it’s best to delete these accounts. I’ve just had the unsettling experience of finding out that someone has hacked a forum where I had a user account and been posting messages in my name – using my first and last name!! If they were just using my username I wouldn’t have minded so much but they were actually using my real name. Thankfully I didn’t find anything offensive they had posted!!
We are only known in the online world by our work, writing and reputation. If someone else is going around doing things in my name that can come back to hurt me. (It’s also creepy)
I usually use a nickname when signing up for anything of this nature except for here, the Linux mailing lists I’m on and the linux.conf.au website. I am security conscious and I keep my passwords secret. I know what constitutes a strong password and what is a weak one. I don’t remember registering for this particular forum with my real name but I will definitely be even more careful in the future.
If one of your online passwords is compromised and it’s identifiable as yours and you have similar passwords (naughty, naughty) then you should change them immediately.