They have intentionally made ads which cannot be closed without visiting the advertiser's host site. I can't believe this is legal honestly, and as mentioned in a below review it's deeply unethical. For shame, y'all. The other recent bad review is also correct that messages fail to send so often that the app is unusable. You have to constantly close the app and clear cache, and it's still up in the air whether it'll function. Messaging is kind of the whole thing so it's a shame when you can't.