Block friends' app on Facebook- There are several annoying things that could happen on Facebook. Among these is getting an invite from your friend to download a game, help you with lives or help you unlock the next level. So how do you put a stop to this? Simple, just block that friends' app invitation. Check it out:
How do I Block Friends app on Facebook?
To block your Facebook friends apps you need to pay a visit to Facebook blocking center (Manage Blocking).
You can also reach the BLOCKING settings via this link: facebook.com/settings?tab=blocking
Visit the link through a web browser or simply go to Settings >> Blocking >> Manage Blocking
You will find a place to block apps - search for the app and block it.