Two thirds of cookies on sites are from third parties

"As UK companies scramble to comply with new laws requiring them to disclose and get permission for all the cookies they use, a new study has found that more than two thirds of all the bits of tracker code on websites are from third parties. Which means they are essentially for delivering targeted advertising or analysing behaviour across the website."

Source:  Data from Truste, reported by the Financial Times, 18th April 2012