With facebook they could know about you EVEN when you are not into facefook.
You know , they make people tag their photos with the names on it, with face detection. So the tree letter agencies (NSA..) have registering of events they previously did not have access to: Your friends weeding photos tells them you were there. They do not have to ask anymore. They know everything about anyone with redundancy(multiple people making photos). You are your friends spy.
Once you tag your photos you do their work, instead of having to analyze 5 million pixels x 4 bytes = 20MBytes of data per photo, you reduce it to a 20Bytes name they can plot on a link graph with 1 million more with minimum effort.
With facebook they could know about you EVEN when you are not into facefook.
You know , they make people tag their photos with the names on it, with face detection. So the tree letter agencies (NSA..) have registering of events they previously did not have access to: Your friends weeding photos tells them you were there. They do not have to ask anymore. They know everything about anyone with redundancy(multiple people making photos). You are your friends spy.
Once you tag your photos you do their work, instead of having to analyze 5 million pixels x 4 bytes = 20MBytes of data per photo, you reduce it to a 20Bytes name they can plot on a link graph with 1 million more with minimum effort.