The web pages I frequent summed up by the general types of posts I see:

Facebook: “All the people on my friends list are going to pile on to 1. Defend your point or 2. Go on at length about how wrong you are.”

Twitter: “You made a valid point! Let’s discuss like adults and have a productive conversation.”

Online newspaper publications: “I like commenting anonymously because I can say all the ignorant things I want about issues I know nothing about.”

Reddit: “Your statement makes me feel bad about myself. Time to take it personally and out of context and fight with you about it for a day and a half!”