Creating a courteous and constructive comment culture discusses why some apps have better comment cultures than others. It analyzes examples of "crap comment culture" on YouTube and AddictingGames, which tend to be short, negative, off-topic, and include insults. In contrast, "cool comment culture" sites like Vimeo and Kongregate tend to have comments that are at least two sentences, mostly positive, on-topic, and never hateful even if negative. The document suggests mechanisms like requiring logins, moderation, spam checking, voting, and rewarding constructive comments can encourage a more positive culture.