Viewing progress of your own and others.
Why do some people have a progress graph and others do not? Also some of my students have the option to view how their peers are progressing in the class and others do not have this option. Why is that? Thank you in advance.
Duolingo constantly runs many A/B tests. That's how they determine which features to implement in order to increase retention (of both knowledge and users), efficiency of learning, etc.