About 80 percent of the photos on Flickr are public and searchable by everyone. In one sense, it's a place where people upload snapshots from the family reunion, wedding or the birth of a baby or something like that, but it's also a place where people go to show what the world looks like to them.

I think there's a deep impulse in most humans to do creative stuff, whether that's music or art, photography or writing. Most people at some point in their life say they want to do something creative - they want to be an actor, a director, a writer, a poet, a painter or whatever.

Flickr was designed partly to market itself. There are a lot features, in place early on, that let people take their photo, upload it to Flickr and post them elsewhere, on their own Web site or their blog, which meant a lot of incoming links.

Stewart Butterfield Quotes