Flickr had 5,934 uploads in the last minute!  That's minute not hour or day or week!   What can you do on Flickr?  Upload photos; edit them; organize them into sets or collections; share them; add them to a map that shows where you shot them; purchase products using these photos and share them with others.  As a teacher, I can find photos and save them to a folder so young students aren't out on the web searching for photos for projects.

If you have the ability to set up safe searches, there are some great ways to use Flickr in the classroom.  Use the #haiku tag to demonstrate ways to write haikus and then give students photos and have them write their own.  Or, use the app http://www.pimpampum.net/bookr/? that allows you to search for a topic and create an online book.

Oh yes, with Flickr, a picture is definitely worth a thousand words.