Delicious

Delicious is a social bookmarking web service for storing, sharing, and discovering web bookmarks. The site was founded by Joshua Schachter in 2003 and acquired by Yahoo! in 2005. By the end of 2008, the service claimed more than 5.3 million users and 180 million unique bookmarked URLs. It is headquartered in Sunnyvale, California.

The site was re-sold to AVOS Systems on April 27, 2011 and relaunched in a "back to beta" state on 27 September that year.Delicious uses a non-hierarchical classification system in which users can tag each of their bookmarks with freely chosen index terms (generating a kind of folksonomy).