Why no global leaderboard? – Memrise Easy Language Learning Review

Whats the point of a leaderboard where you have to invite friends. A global leaderboard like what Duolingo has would be good. What if we have no friends or our friends never even use the app. Implement a new leaderboard system to further incentivize using Memrise and learning a new language.
Review by Txvis on Memrise Easy Language Learning.