Joshua Schachter, the founder of Del.icio.us, confirmed a posting on the New York-based start-up's site that the company had been acquired by Yahoo. A Yahoo representative confirmed that the agreement to buy Del.icio.us had closed on Friday.

Neither party disclosed financial terms.

"We are joining forces to build my vision of creating a way for people to remember things together," Schachter told Reuters in a phone interview. "It is a shared-memory site."

Del.icio.us provides a simple way for hundreds of thousands of Web users to share and categorize their favorite Web page bookmarks as Web pages.