How do I know my overall ranking amongst my friends and against all players regarding level?

Ryan_M_Andrée

Is there a way to find out who is on the highest level?  What does the number above my avatar indicate?

KingsPinn

There is no overall ranking as the levels are continous. There's normally a top 3 for each level score wise but that's about it really. I'm not sure what number you are referring to above your avatar. Do you have a screenshot?