Since I cannot immediately delete my entire FB account, I have removed myself from most groups, unliked all Pages, turned off notifications, including email notifications, set maximum privacy settings, deleted all of my photo albums, and am gradually deleting all older Public posts.
However, with news that numerous apps still exist which harvest data from “friends”, I will today begin unfriending up to 3/4ths of my FB friends list to shrink the privacy exposure front even more.