SXSW Interactive is pleased to announce Facebook’s founder and CEO, Mark Zuckerberg, as the keynote presentation on Sunday, March 9 at 2:00 PM. Sarah Lacy, author, BusinessWeek columist and co-host of Yahoo Finance’s “TeckTicker” will host the on-stage interview with Zuckerberg, the 23-year-old who has emerged as one of the brightest young minds in the booming social media industry. With his direction, Facebook has grown from a college networking tool to a global phenomenon. The site is now used by people of all ages with over 50% of users returning daily. As Facebook continues to launch new innovations and expand functionality with Facebook Platform, the number of users on the site continues to soar — more than 60 million at last count.