One important trick is to dumb down your language, use uncomplicated verbiage and stay away from grammar ! Never try to express complex thoughts, be positive, fast, and people will upvote you, especially if you have nothing constructive to say. It's not about that, it's about status within the herd. Comments like "Cat great, good haejin" with an infantile gif attached have a success guarantee - but yeah, why not use bots ;)