Facebook founder Mark Zuckerberg Wednesday unveiled a box of new tools that he said will extend the social networking phenomenon to every corner of the internet.

The announcement came at a conference for Facebook developers called F8, in which Zuckerberg revealed that the world's largest social networking site has 400 million registered users. These include 100 million who use Facebook Connect, the company's online identity technology that allows users to use their profile on thousands of other websites.