Today Facebook has access to my timeline on Moves (which they bought), which means that potentially they know where/when I was for the last six month with a good degree of precision.
They also have access to billions of geotagged photos. Cross referencing this information Facebook could easily generate a timeline of photos taken around me. And this is with today’s technology.
There all all kind of privacy issues to discuss, yet there are quite exciting possibilities with photography. Just ahead.