How to Block an App on Facebook
There are three things you can do to block app messages in Facebook. First, if you're no longer using an app, you can remove it to stop getting messages.https://www.facebook.com/help/170585223002660 Second, you can block all messages from...
Block a specific app. In the Block apps section, in the Block apps field, start typing the name of an app you'd like to block. When you see the ...