According to the Huffington Post (See below photo of article and URL) Facebook Messenger's Terms of Service invades your privacy and takes over your phone. Read the below article for more shocking information; and join the Facebook Protest, by chaining your profile pic to the "Facebook Get Your Hand Out My Pocket."
http://www.huffingtonpost.com/sam-fiorella/the-insidiousness-of-face_b_4365645.html