Reddit does have a source of income, which is getting the tokens to award medals. Reddit has been moving traffic from forum sites away to reddit. In fact, it can be said that Reddit is the only forum site that is still alive. It can be agreed that Facebook and other social media platforms have decreased traffic to forum sites, however for forum purposes users would still have to go to a forum site. If one compares the number of forum users in AnandTech forums or any other forum site, between now and before Reddit existed, it will be clearly seen that the active number of users have had a higher decline rate after the introduction of Reddit.