Flickr

Not much to say about this one. I don't use it much, never really have. I liked the Yahoo/Google duopoly back when it existed; the contrast and contest between the two was interesting and ultimately good for us as end users. But Yahoo's failing health makes it a much less interesting service, and I trust them less and less as they sink into a morass of hazy corporate ownership. So Flickr can go now. Sadly.