This is a very helpful article that I stumbled on by Age of Shitlords! It details exactly how you can locate the person who reported you on Facebook. Turns out it's a whole lot easier than you might expect.

https://theredpillnation.wordpress.com/2016/03/06/how-to-find-out-who-reported-you-on-facebook/ Age of Shitlords also has other articles that you'll find interesting and helpful and I would encourage you check out his blog as well http://ageofshitlords.com/