You have to be afraid of those close to your that have Android devices.
The seemingly normal action of taking a picture at a private party is now Google’s own private CCTV network in action. Photos will be uploaded automatically to Google’s cloud, analysed and categorised. Even if you choose not to use any of their services, they will be able to build a profile of you, based on photos and videos your friends take of you.

http://xavierbertels.com/blog/google-photos-google-s-endloesung-for-privacy