Timeline, which at a developer conference and plans to roll out to users in a few weeks, summarizes important past events in a one-page display.

According to Facebook CEO Mark Zuckerberg, Timeline is "the story of your life,"

That has experts at U.K.-based Sophos concerned.

"Timeline makes it a heck of a lot easier [for attackers] to collect information on people," said Chet Wisniewski, a Sophos security researcher. "It's not that the data isn't already there on Facebook, but it's currently not in an easy-to-use format."

Cybercriminals often unearth personal details from social networking sites to craft targeted attacks, noted Wisniewski, and Timeline will make their job simpler.