I’m a big fan of Delicious. Have been using it since 2006. And was glad when former YouTube Co-Founders bought it from Yahoo a few years ago to keep it alive. Thinking how these guys have built the #2 most visited website in the world, you would think they wouldn’t have any problems with their next project.
It hasn’t been an easy ride. They’ve changed quite a bit since then, and just as they did with YouTube, they’ve followed the same startup logic: Try something, see what happens, if it works do some more and if it doesn’t, fix it.