PSA: Facebook Messenger Shares Your Location with Every Message
You’re probably aware that Facebook collects a ton of information about you, but if you’re using the mobile Messenger app, that also means your location data as well. A new Chrome extension called Marauders Map lets anyone you’ve sent a message see that location information all at once.
27 May 2015 ... By default, the mobile Messenger app logs your location in every message (you can tell if it's on if the GPS icon next to the text box is blue).