I love Memrise and think it is well done. But I find it disappointing that it has very little to offer with regard to find friends, learning buddies etc. both just from within Memrise and by importing friends from connected social media like Facebook, Google or Twitter. Especially since Memrise already can connect to Facebook anyway.
Other learning apps allow you to easily find who of your friends is also on the same app or maybe even learning the same language and connect to them in the app for learning together.
Another very cool way to do this, maybe even better, would be to have some way to connect with other Memrise users based on certain features, e.g.: can speak the same language(s) want to learn the same language(s), or mutually speak the language the other wants to learn. Again, this would tremendously increase the usefulness of the app.