those cute little cows you re earning on farmville may cost you something worth much more, your friev prooiv schiff according to the wall street journal at least 25 popular facebook applications such as mafia wars and texas hold em share user information with more than a dozen third party companies. bottom line is advertisers might know what applications you re use and what you re going them. reporter: leaks occurred even when settings were completely private. applications create user pro files tracking web siteses s visitsed to the names of your facebook friends. the company says developers cannot disclose user information to ad networks and data brokers. we take strong neerns force this policy, including suspends and disabling applications that violate it. the company also says the leaking of user names did not lead to sharing of private information. recently the company was