Zuckerberg celebrates birthday, company going public

Facebook CEO Mark Zuckerberg has a lot to look forward to this week.  He is turning 28 today and his social media empire is going public this week.  It's expected to start trading on Wall Street on Friday at $28 to $35 a share.

Zuckerberg and his team have been traveling around the country, answering questions from investors on their IPO roadshow.  The company is expected to sell 337 million shares, making this possibly one of the largest IPO's in history.

Meantime, the work continues to expand and modify Facebook.  The company is signaling it may start showing users ads on sites other than Facebook. The company will target those pitches to interests and hobbies users express on the site.

As part of moves coming a week before Facebook's IPO, the company is also updating its data use policy. It will give people more clarity on how the company uses information they share. The policy changes are in response to an audit by Irish data-protection authorities. They called on Facebook to be more transparent about how it collects people's data and uses it for advertising -- as well as how long Facebook keeps such information.