Ads in App name is Fitpro
Application name is Fitpro. Previously there were no ads in this app for a long time but today it is full of pop-up and video ads.
I just installed the app to check my logs and see what's up. Seems to hit 2 servers, two of them are basically blocked by every filter. The one that is probably getting you ads is graph.facebook.com. Its not blocked by many filters because it also brakes Official Facebook apps functionality you can use third-party clients to use Facebook with the domain still blocked. Also a filter like 1HostPro has it blocked by default.
As info on graph.facebook.com its the domain that both initializes and provides Ads on apps but also makes the Official Facebook app function properly.