Facebook Data From More Than 500 Million Users Found Online

Chuck Goolsbee, site director for Facebook's Prineville data centers, shows the computer servers that store users' photos and other data at the Facebook site in Prineville, Ore., on Oct. 15, 2013. Andy Tullis/The Bulletin via AP

NEW YORK—Details from more than 500 million Facebook users have been found available on a website for hackers.

While the information appears to be several years old, it’s another example of the vast amount of information collected by Facebook and other social media sites, and the limits to how secure that information is.