And on Android you can have FB Messenger as your SMS app. I don't know any of the 7 people who have actually done that, so can't comment on it. 🙂
Seriously though, FB Messenger is in my opinion not a bad messaging platform. Does well with pics and vids. The only thing I don't like is there doesn't seem to be a way to turn off read receipts. My wife freaks about that, and often won't open it in fear that a message she doesn't want to acknowledge reading yet will get marked read (meanwhile she already read it, or part of it, via the notification).
Mike