Whenever I was eleven, I wrote on a wrestling forum. I was inexperienced and didn't really know what I was doing half of the time. Anyway, I had my own little forum website, and I took it upon myself to advertise here and there. I had gotten banned on a lot of forums for it, but I eventually stopped, and settled for simply posting it in my signature. Eventually, a gentleman that will remain unnamed went ahead and joined my forum, and went ahead and made me a banner for my website, which had other-wise been bare. I appreciated it, but eventually came to the discovery that the man had actually been somebody I had tried to "merge" my forum with a long time ago. I banned him immediately, thinking that we had gotten into a fight before, and there had to have been an angle that he was playing. Probably shouldn't have, but I was stupid.
This all sounds very kiddy, and for awhile it was. I didn't see him for about a month until finally he revisited the site and sent me a "cease and desist" letter that told me that if I didn't delete his banner then he'd be "taking me to court". Once again, young and stupid, I actually believed him for a little while and obliged. He, and a couple of his friends spammed up my Yahoo! Instant Messenger with porn, but that was only the tip of the ice-berg for the shenanigans. He created a forum website made to look like an absolute carbon-copy of mine, spammed up my forum with his link, and whenever I asked him to delete the forum, he calmly told me that he'd make it sure that the forums aren't interconnected. I eventually closed down my forum and ran for the hills, but whenever I came back to the forum a year later, I found out that he was still spamming the forum like I was there.
Funny fact, I actually got a message from him a couple of months ago asking whether or not I am still running that "faggy wrestling forum". There has been other occurrences with him spamming me, but it's mostly behind me.
Basically, it was a matter of him taking advantage of my lack of experience with the internet, and I know that I'll never actually let somebody bother me over the internet again. It isn't worth it, and I'm not going to "hide my identity" either. I have a page on my website that tells people all of the forums that I post on, etc., because I'm not going to live in fear of anyone or anything. It isn't worth it.