Flickr a few days ago. At one point I came across this photostream which had a host of fascination images from someone's life. However, there were few details about who took the pictures. The vast majority of the images had just a code number from the camera and the Flickr profile gave no clues either.
This got me thinking. Given the richness of the images and the lack of information this would make for a wonderful writing exercise. The basic idea is that students look at the Flickr page and create a biography of the person who took them.