At Facebook, security is a top priority -- security for CEO Mark Zuckerberg, that is. The social-networking giant spent more than 6.5 million last year on bodyguards and other measures to protect Zuckerberg and his growing family, according to a recent regulatory filing. The cost to protect Zuckerberg topped 7.8 million in 2014, up from 4.2 million the previous year, according to the document. In all, the company has shelled out 19 million on security for the CEO over the past three years. He is reportedly so concerned about his own security that he has no less than 16 people protecting him at his Californian home.

Two of the technology industry's most powerful leaders are at odds when it comes to artificial intelligence. Facebook Chief Mark Zuckerberg on Sunday called Musk's dire warnings overblown and described himself as "optimistic." "People who are naysayers and try to drum up these doomsday scenarios -- I don't understand it," Zuckerberg said while taking questions via a Facebook Live broadcast. Musk's electric car company is using the technology to enhance self-driving features in its vehicles.

Mark Zuckerberg says Facebook will notify the estimated 50 million people whose data was extracted from the social network and handed off to a tech firm working for the Trump campaign.

ATLANTA--It was not until a few years after he moved in that Zachary Anderson realized that he was not, in fact, the owner of the house he thought he'd purchased. Anderson had already spent tens of thousands of dollars repairing a hole in the roof, replacing a cracked sidewalk, and fixing the ceilings of the small two-bedroom home where he lives in southwest Atlanta. He was trying to get a reduction in his property taxes when his brother, who was helping him with his taxes, looked up the property in public records and found that the owner of the home was actually listed as Harbour Portfolio VII LP. "It's like a trick," Anderson, a 57-year-old, told me, sitting in front of a wood-burning fireplace he'd installed in the living room of the house to lower his heating bills. "They get free work out of a lot of people." Anderson had entered into a contract for deed, a type of transaction that was rampant in the 1950s and 1960s before African Americans had access to avenues of conventional lending.

Do you trust Mark Zuckerberg? From the moment the Facebook founder entered the public eye in 2003 for creating a Harvard student hot-or-not rating site, he's been apologizing. So we collected this abbreviated history of his public mea culpas. It reads like a record on repeat. Zuckerberg, who made "move fast and break things" his slogan, says sorry for being naive, and then promises solutions such as privacy "controls," "transparency" and better policy "enforcement." And then he promises it again the next time.