flickr.com is evidence of that fact.
So I decided to put together a Flickr group named Pleakley In Tomorrowland commemorating our Pleakley picture. So far, there's 14 pictures in the group; not bad for a group with a ridiculously specific criterion for joining.
(Hey, try it for yourself if you are so inclined: take one of your pictures, start a ridiculously specific Flickr group, and see how many people you can get to post their relevant photos to it.)
(In case you're wondering, I made the mosaic using one of fd's flickr toys - the Mosaic Maker, of course.)