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Method 1
Sign-in to your Facebook account and then go to Settings > Apps settings:Move your mouse cursor over the desired app and then click on the Edit Settings (small pencil icon):
Click on the drop menu below Send you notifications and select No:
Click on Save.
Method 2
Go to Notifications settings and then click on the Edit button displayed next to On Facebook:Move to App requests and activity and then click on Edit:
Toggle notifications On/Off for the desired apps:
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