(noun) On forums, any topic in which people post for the sake of increasing their post count, post farms often go unnoticed as people will post something which looks like they have something to say on the subject even though they are saying the same thing as everyone else.
Person 1: Have you seen the latest quiz topic?
Person 2: You know those are all just post farms right?
Person 1: So? who cares the mods don't do anything about them.