in a recent study,Consumer Reports found that of 150 millon Americans on Facebook, at least 4.8 millon are willingly sharing in formation that could be used against them in way. That includes plans to travel on a particular day, which burglars could use time robberies, or Liking a page about a particular health condition or treatment,which insurers could use to deny coverage. 13 million users have never adjusted Facebook's privacy controls, which allow friends using Facebook applications to unwittingly transfer your data to a third party without your knowledge. credit card companies and other similar organizations have begun engaging in "weblining", taken fromthe phrase redlining, by altering their treatment of you besed on the actions of other people with profiles similar to yours.