Earlier quoted context omitted.
wait, I am still using (and paying) Flickr ...
Except it is now owned and run by the father and son who founded SmugMug. It probably has a chance of surviving under their leadership.
In this same vein, I always thought Tumblr had a great design for a blog. It hits the perfect balance between a microblog like Twitter, and a fat blog like Wordpress. It had various stigma's around the type of people who posted there, which seems to have only gotten worse over the years. It is a shell of its former self and yet anther site that fell on hard times after Yahoo ownership.
Yahoo really is where Web 2.0 went to die.