They do have things to keep people from spamming but thats only if you type the exact same message..if you look at a gil spammers message, there are always 4 letters or numbers at the end of each message, all the bot program has to do is change one of those and voila its not considered spam to the program. Sucks I know and I wish that SE would take care of them so they could actually take care of my harassment ticket...