[danudey]

Photos and videos of someone and where they are is valuable for ads. The logo on the beer you're holding in your photo with your friends at the bar, the faces of those friends and what drinks they have, the geolocation information in the image metadata, the date and time the photo was taken, and so on. All of that is valuable data to Facebook, and they're operating at a scale that allows them to fully harvest and take advantage of all of that and more.

At Facebook's scale, even tiny, inconsequential data can be useful in aggregate.