I make a habit of going through new #introduceyourself posts, and I can tell you that I've seen patterns on there as well. There are a ton of garbage empty accounts being made all over the globe. I strongly suspect a lot of the new account posts are not even real people. The intro post is probably being generated by a bot. Perhaps they think the intro post gives the account more legitimacy. Then later it gets used in upvote bot scams. Either way though, the system is broken as it is.