A look at what those apps could access may freak you out. Some of these so-called legacy apps required user data as varied as your friends’ religions, relationship statuses and photos. Bet you didn’t know you still had them. Even developers may not be aware their old apps are still hanging out on Facebook.
…One app, called Samsung Mobile, required permission for access to 36 pieces of information about you and your friends. That ranged from your timeline posts to your friends’ photos and religious and political views.

Source: Facebook’s app cleanup may be harder than Mark Zuckerberg thinks – CNET
Android devices are apparently surveillance devices. Am wondering about switching to iPhone in the future as Google has been in the same business – surveillance and propaganda – as Facebook.