Instagram is the current leader, with Kik, Snapchat, and Messenger in some messy run-off after. I have to admit a lot of surprised how quickly Instagram got to

Instagram is the current leader, with Kik, Snapchat, and Messenger in some messy run-off after. I have to admit a lot of surprised how quickly Instagram got to parity and overtook Snapchat with my family, but I'm at least two decades out of that demographic so that's probably more of me being old and out of it than anything else!