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It seems Facebook's planetary ubiquity is inevitable ... until you take a look at the sheer size ofthose competitors: Total membership of the four major non-U.S. networks total 778 million. Combine that with Twitter's 500 million active users around the globe, and you've got a social horde that eclipses Facebook's.

A Central California man is dead after posting a suicide note on Facebook and then driving his car onto railroad tracks less than an hour later.

Many businesses are using gamification to get people hooked on their products and services — and it is working, thanks to smartphones and the Internet.

Facebook says it is testing a service that will charge users $1 to guarantee that messages they send to people they are not connected to arrive in users' inboxes, rather than in an often-ignored folder called "other."

The battle lines are sharpening between Facebook and Twitter, as they fight to become the prime hub for photo sharing on the Internet.

Instagram, the popular photo-sharing service that Facebook bought this year, is the target of a storm of outrage on Twitter and other sites after a change in its user agreement hinted that it might use shared photos in ads.

Facebook isn't just for goofy pictures and silly chatter. Shoppers' actions online help dictate what's in stores this holiday season.

Massachusetts' securities regulator fined Morgan Stanley $5 million over its handling of Facebook's IPO, saying investment bankers had "improper influence" over the research analysts covering Facebook.

Where are employees most satisfied in their jobs? Beer tasters at Sam Adams? Photographers at Playboy? Shoppers for Saks? Mickey at Disneyland? No. The happiest employees on Earth work at Facebook.

Facebook took steps to simplify its privacy settings, in its latest bid to give consumers more control and clarity over what personal information is shared.