I think the conclusions this infographic draws are absurd. Let me explain by way of analogy:<p>Reddit and HackerNews are two sites on the internet, each with their own community of commenters. Let us assume for the sake of argument that Reddit users enjoy inane off-topic humor in their comment threads, and HackerNews users enjoy thoughtful posts with occasional dry wit. Let us also assume that Reddit users can post on HackerNews using their Reddit credentials, and vice versa.<p>After some analysis of their comment threads, Reddit makes the following claim: Reddit users drive communities! After all, nearly all of the comments on the site are inane banter from Reddit users. People from HackerNews rarely comment on the site, and Reddit's indicators of comment quality show that Reddit users generally post higher quality comments. They get so many upvotes!<p>But on the other hand, HackerNews claims that HN users drive communities! After all, nearly all of the comments are thoughtful and insightful posts from HackerNews users. People from Reddit hardly ever comment on HN articles, and Paul Graham's indicators of quality show that HN users generally post higher quality comments. Reddit comments tend to get downvoted to oblivion.<p>Anyways, I just wanted to show by this example that if you take a service that caters to a particular demographic, and ask its users to rate each other, of course you will find that the demographic comes out in a positive light.