|It is used by Facebook to deliver a series of advertisement products such as real time bidding from third party advertisers.
|It is used by Google DoubleClick to register and report the website user’s actions after viewing or clicking one of the advertiser’s ads with the purpose of measuring the efficacy of an ad and to present targeted ads to the user.
|It collects data on visitor behaviour from multiple websites, in order to present more relevant advertisement – This also allows the website to limit the number of times that they are shown the same advertisement.
|It is used by Google AdSense for experimenting with advertisement efficiency across websites using their services.
|It is used by Google AdWords to re-engage visitors that are likely to convert to customers based on the visitor’s online behaviour across websites.
|It tracks if the user has shown interest in specific products or events across multiple websites and detects how the user navigates between sites. This is used for measurement of advertisement efforts and facilitates payment of referral-fees between websites.
|It is used to track user’s interaction with embedded content.
|It tries to estimate the users’ bandwidth on pages with integrated YouTube videos.
|It registers a unique ID to keep statistics of what videos from YouTube the user has seen.