"Call us paranoid or prudent -- we're paid to worry about this -- but for 99% of people, the danger doesn't even cross their mind," said Wisniewski.

In an Sophos ran on its website today, nearly 50% agreed that the Facebook Timeline worried them, while about 17% said they liked the idea or would get used to it.

Wisniewski admitted that the poll probably doesn't reflect most Facebook users' opinions. "They're doubly self-selected," he acknowledged, "first for taking the survey and second because they're concerned enough about security to go to our website."

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at , or subscribe to . His e-mail address is .

in Computerworld's Security Topic Center.