The Associated Press

This Feb. 8, 2012 photo shows a mural at Facebook headquarters in Menlo Park, Calif. Intruders recently infiltrated the systems running the world's largest online social network but did not steal any sensitive information about Facebook's more than 1 billion users, according to a blog posting Friday, Feb. 15, 2013, by the company's security team. (AP Photo/Paul Sakuma)

By MICHAEL LIEDTKE AP Technology Writer

SAN FRANCISCO (AP) — Facebook is getting an unwelcome look at the shady side of the hacking culture that CEO Mark Zuckerberg celebrates.

Intruders recently infiltrated the systems running the world’s largest online social network but did not steal any sensitive information about Facebook’s more than 1 billion users, according to a blog posting Friday by the company’s security team.

The unsettling revelation is the latest breach to expose the digital cracks in a society and an economy that is storing an ever-growing volume of personal and business data online.

The news didn’t seem to faze investors. Facebook Inc.’s stock dipped 10 cents to $28.22 in Friday’s extended trading.

The main building at Facebook’s Menlo Park, Calif., headquarters lists its address as 1 Hacker Way. From there, Facebook serves as the gatekeeper for billions of potentially embarrassing photos and messages that get posted each month.

This time, at least, that material didn’t get swept up in the digital break-in that Facebook said it discovered last month. The company didn’t say why it waited until the afternoon before a holiday weekend to inform its users about the hack.