If it's truly anonymous, then it doesn't matter if someone forges your cookie.
Edit/Note: This does mean that any site could force visitors to participate in a DDoS attack. What prevents this from becoming common is the number of visitors required for a DDoS attack to succeed.
This would probably not work on this site because the number of users is only ~6000. I don't know how many users would actually be required to dent a typical site. I do know that "Anonymous" recently used a client side DDoS tool on a large number of users.
Edit 2: In light of http://news.ycombinator.com/item?id=4000301, I'll point out that XSS could result in the forced posting of illegal content, as well.
I wanted to play around with it some more, but it's just pure spam now.
The whole point of your experiment was to see how people would act if completely anonymous, right? They aren't. So your experiment is flawed.
I honestly thought you were going for full anonymity. In fact, my first thought was that you were taking it a step further than 4chan and that it would be interesting to watch.
Note that I'm not "mad." I only pointed out that it was misleading.
I like it, and envy the fact you could just create this on a whim over a weekend. I wish I had that kind of discipline when it comes to some of my spontaneous ideas!
It'd probably be a good idea to crop titles and contents if they exceed a particular length.
and that guy is not going to get banned