There are two types of deletion of user data:
1. Social profile data accesesd via Facebook, Linkedin, Twitter, Microsoft or any 3rd party app
2. Delete complete user data within app
1. If you just want to remove social app connected data.
Go to your user login --> Click on profile seting --> Social Connect --> Select Social app such as Facebook or Linkedin
--> then click on disconnect/remove -->Once again confirm on popup to remove social app connected data.
3. Delete complete user data:
Go to your user login --> Click on profile seting --> Account settings --> click on delete account
Accept 'Ok' on warning message