Facebook provides users with options on the level of access others have to users' personal information. However, many users install mini-programs, called widgets or applications, to personalize their pages. The company allows developers to see members' information when they add applications, to personal pages. The company says that 95% of its users have installed at least one mini-program.
A Flashy Facebook Page, at a Cost to Privacy, Washington Post, June 12, 2008