Same situation in the group messaging space. I am the cofounder of Groupie, which is tied with Beluga as the highest rated group messaging app on the App Store. We have tens of thousands of users and tens of thousands of groups. In fact, you cant search for GroupMe without seeing Groupie, yet we've never been covered. It's a mystery to me but that ultimately hasn't stopped us from growing and with a good product, it won't stop you from growing either.
On that note, happy to make myself available you should want to discuss anything since we've probably hit a few hurdles that you're undoubtedly going to confront.
Good luck.
Leo at groupie dot co