Facebook is referred to as an imitation of MySpace. Of course, Friendster was earlier, but really--they're all just online Frontpages, aren't they? (I've never used any of them, actually.)
About Flickr: "so we built a lot of features that were deliberately viral."
Ugh. A raw FTP server has half the features of Flickr, and 95 percent of the features that actually matter. It's reading panegyrics about upload-your-photo services that trouble me: Are we all just hacks? I mean, it wasn't so long ago the entrepenuership meant building railroads and auto factories. Now--you can be a millionaire if you use the "