Below are some points coming from the article in New York Times:
I use an iPhone, because Apple has some reasonable tech in place to protect your privacy. (Android phones, running Google’s operating system, are voracious and arguably unscrupulous collectors of information about their owners; an Android phone with Chrome open sends your location back to Google about 300 times a day, according to one study.)
Is deleting Facebook an effective way to protect privacy?
Not in the slightest.
It may interfere with Facebook’s ability to track you as a consumer. But almost every website you visit or app you have on your phone is to some extent tracking where you go and what you do.
Moon, J. (2019). He Reported on Facebook. Now He Approaches It With Caution.. [online] Nytimes.com. Available at: https://www.nytimes.com/2019/01/23/technology/personaltech/facebook-online-privacy.html [Accessed 25 Jan. 2019].