YouTube Founders Aim to Revamp Delicious – NYTimes.com:
“Ms. Fake said Delicious might attract a wider audience now that more people are accustomed to sharing links and information socially — something foreign to most people eight years ago.
“It didn’t quite get to the mainstream before,” she said, “but I’m optimistic that it can get there now.””
Sharing and privacy were big barriers to mass adoption for sites like Delicious.