Well, many of them are looking to earn a quick buck and are trying to gain followers as fast as possible before posting some random stuff. But that follow4follow method is pretty pointless here, as the only followers you will attract will be new members of the site and even getting them to like your post won't do much in terms of money, as for a new member (as myself) the payout for liking something is 0.01; not a lot by any means. So the best way to grow in popularity is the old-fashioned way, posting original content or at least sharing some quality content from other social media platforms.