I just saw this on Facebook, I am sure the video is on YouTube. Its about the flashlight apps for Android that send your GPS info, mobile data, etc. to these developers, some of this apps have 100,000 downloads, that's a lot of data they have accumulated.
https://www.facebook.com/disturbreality/videos/1104755862901823/?pnref=story
https://www.facebook.com/disturbreality/videos/1104755862901823/?pnref=story