As a result of being resource-starved, Flickr quit planting the anchors it needed to climb ever higher. It missed the boat on local, on real time, on mobile, and even ultimately on social—the field it pioneered. And so, it never became the Flickr of video; YouTube snagged that ring. It never became the Flickr of people, which was of course Facebook. It remained the Flickr of photos. At least, until Instagram came along.
Also:
The reason we bought Flickr was not the community. We didn’t give a shit about that. The theory behind buying Flickr was not to increase social connections, it was to monetize the image index. It was totally not about social communities or social networking. It was certainly nothing to do with the users.
A long, but interesting read.