"There have been a host of Facebook virus attacks in the little over a decade it’s been in existence. Some are fairly easy to spot and avoid, others look fairly innocuous until it’s too late. Here, we’ve listed the most common Facebook virus attacks and how to protect yourself from them."
Click on the link above to read their full story or here.
In the past, it was very difficult to work out what your privacy settings actually were and would change, often without users being aware. This has improved but it is still very difficult to work out some of the settings. For example, to delete you Facebook account can be problematic because even if you do find where to do it, should you inadvertently connect to Facebook again from some device, it negates your deletion.
Source article: Wired- Facebook Privacy Issues
Another article on the same subject: What the F*** Was Facebook Thinking and yet another one one how to delete your Facebook at https://vpnandgo.com/delete-facebook-account/