Display weekly leaderboard for mobile apps
According to the appearance of the duolingo app on my iPad, it does not display the leaderboard in "This week", "This month", and "All times" like how they do it on the web. But I have friends who just joined Duolingo and are working hard. Though they are far behind me in total, I still want to compete with them on the weekly leader board! So maybe you can consider to display the weekly leaderboards in the mobile app.