The question of internet responsibility is one that has been debated for an extraordinary amount of years. I remember first hearing about it on the news with the site yellow pages. At the time, the owner of the site was being sued for the illegal use of yellow pages for sex trafficing. The argument was that since the owner was aware that the site was used for trafficking he should be held responsible for the illegal activity. In this case I believe the owner won as he did not do anything directly wrong.
Although I could see how it would be easy to sue someone because of the activity done on their online forum, I do not believe it is just. The owners of the software or websites are simply creators and should not be held responsible for other people's actions. Should google be sued for housing illegal content? No, because it is not responsible for what people upload to it. That seems obvious.The purpose of the site is important, however. A website made for a positive reason can not be punished if someone abuses the system. However, if a website is made for something negative it should reap the full consequences of its actions.