Facebook just recently amended its user agreement. When a picture or a video is uploaded, that picture is granted a non-exclusive, royalty-free license. In a nut shell that means Meta can take your picture or video and sell access to whom ever is willing to pay for it. This is a summary of the license agreement. When you dive deeper into the fine print, if you delete your facebook, everything that is uploaded is archived and facebook does what it wants with what is uploaded.
Under the intellectual property agreement, if say you uploaded a song and claimed it as your own when it was clearly a cover, then your content gets removed. If you uploaded a memorial video of say someone who died and it had a song that fell under the guidelines of intellectual property, (music file from burnt cd) then it would get removed.
Under content types, if it is perceived as threatening, or as hate speech, facebook will remove it. Also don't upload a D or V pic.
If you use third party apps linked to facebook and they are adult oriented, they do not allow it.
Last but not least, you cannot use facebook for illegal use or what is perceived as illegal, misleading, malicious or discriminatory.
Under the licensing clause of the agreement, I was able to actually speak to someone from facebook and because my profile information was so vague at the time, the information I provided couldn't generate a profit for facebook. I feel for the people who place blind faith and ignorance in facebook and store what they hold sacred on facebook when it comes to pictures and videos.