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