I don't get it!
Can someone please tell me why I am in the 'Promotion Zone' on the leader board and what exactly does it mean?
It just mean you are in the top 10 of the arbitrary group of 50 language learners you are in for the current week. You are with a different group of 50 people every week. You are ranked by how many XP you have earned by doing your lessons. I find it motivating. On your cell phone, you can see your weekly ranking by clicking on the "shield". On your PC, it automatically shows to the right when you are in the "Learn" section.