Until 2015, Facebook allowed app developers to access your private messages

The social media giant sells not only demographic data, but also information about how you behave

Source: Facebook: Your personal info for sale – CBS News
As I have previously noted, this article confirms: When you download your FB data, it does NOT include the advertising “purchase behaviors” that advertisers get to see, which includes things you buy outside of Facebook, your derived “interests” and so on. Think about that for ten seconds. The FB app also tracks your location at all times.
Until FB is open and transparent about your personal information, Facebook can not be trusted.
I deleted their app last year – it seemed to be both a power hog and a memory hog. At this time, I will never install the FB apps on an Android device again and I recommend you delete it immediately. It is a specialized spying tool to collect data about you.
Facebook has been and continues to be evil in what they are doing. The only way they have a chance of restoring trust is to (a) replace Zuckerberg with new leadership, (b) be completely open and transparent about what they are doing, and (c) give users actual control of their personal data. Remember, users cannot realistically even delete posts, likes, comments, messages or photos since Facebook intentionally does not provide a bulk edit/delete feature. Until Facebook addresses these issues, Facebook is history for us.