Teaching game about tags

A great idea for teaching and learning about tagging from Joyce Valenza's NeverEndingSearchBlog. The game is called Fastr, developed by Scott Reynen of randomchaos.com. The game generates a group of ten Flickr images and you guess the common tag. As Joyce warns, probably not real appropriate for younger children, given what may pop up in Flickr, although when I tried it I didn't see anything inappropriate (I only guessed about half).