Via Technophilia:
In December 2010, a slide leaked from a Yahoo meeting indicated that Delicious was to be shut down. People on Twitter and elsewhere on the web collectively freaked out. Some people had thousands of bookmarks that would seemingly be gone, lost forever at the whim of Yahoo. People started to wonder if someone should instead build an open-source version of Delicious, and others pointed out how extraordinarily hard that would be.
The end result being, people are starting to realize just how frail our data is. We post photos, articles, tweets, and whatever else we want, to lots of different sites, but we don't actually have control over that data once we hit "post."