Upvotes...both giving and receiving. And I've always said that the comment section always means more than actually getting popular memes. That's where I got most of my points, not in popularity but in commenting with users, many of which have become my friends. For instance, I'm commenting now, and I upvoted your meme. If you reply, I'll upvote your reply. If you upvote mine, then we both win. The other reply (currently on this meme at the time of my reply) is there without upvoting. That helps no one. Want to be popular? Be generous with your upvotes! It's not hard, very easy actually.