It was announced that Yahoo bought today. For those of you not familiar with, it is a social bookmarking website that I use to power my “Worthwhile Clicks.” Basically, it allows you to add a URL, describe the link, and tag it with descriptive terms so that it’s easy for me or other people to find. It seems that Yahoo is buying all of my favorite web applications; first Flickr, then Upcoming, and now

It’s also interesting how Yahoo and Google are acquiring a lot of new features by absorbing innovative companies, but in very different directions. Google seems intent on adding applications—Picasa, Earth/Maps, Talk, and Desktop come to mind—while Yahoo seems focused on social Web 2.0 applications.

It’s a smart move for Yahoo. Their original feature, a human-edited directory, made the company what it is today. Obviously, technology is a driving factor for any search company, but adding an army of devoted, intelligent users may be what Yahoo really wants.