More people than ever can go online from their phones and tablets, but advertising hasn't caught up.

Facebook has a billion users. What other things are in the 10-digit use territory?

Facebook, needing new types of revenue, rolls out a feature that allows users to pay a fee so their posts jump to the top of friends' pages.

The once-popular social media site is revamping its look and aiming to be a destination for musicians and artists.

The personal computer is dead, and more on the future of tech from New York City

Today, over 1.6 billion shares could hit the market in several waves. A huge shareholder sell-off could open the door to talent poaching by competitors.

The latest test of Facebook stock comes tomorrow with the removal of lockups on employee and insider shares.

A look at the screwy economic model of that pesky inbox filler.

A large number "people" on Twitter are just bits of code intent on spamming.

Companies spend dearly to get consumers to "like" them on Facebook, hoping that the promotions and freebies will pay off with greater business.