How is the data used? Is the data sold to third parties? In order to do this, Facebook has to match this action with your account details. If you click on a Facebook "like" or "share" button, this is displayed on your Facebook wall. Is the data ever matched to personally identifiable information? If you are signed in, it will use your unique ID to show you how many of your friends have clicked on the like button and whether or not you have liked the page yourself.Ĭontroversy erupted late last year around this cookie, as it was discovered that a user's unique ID was not deleted when they signed out of Facebook and so could be read when a page with social plugins was loaded. When you visit a page with a social plugin, it will check that cookie. If you have checked "keep me logged in", the cookie will also record this. If you have a Facebook account, you will have a cookie set on your browser containing a unique ID that relates back to your profile. This is done by recording the first and last Facebook pages the browser visited. If a user later decides to create an account, the aim is to find out what convinced them to do it. One is for security purposes and the other two are used to track registration effectiveness. If you do not have a Facebook account but your browser has visited a page in the past, three cookies would have already been set on your browser. If you do not have a Facebook account and your browser has loaded a page, then no cookie is set when you browse a page with social plugins. In order for this to load, Facebook's servers will know the page, the time and date it was loaded and the browser IP address.Īccording to the December 2011 Irish Data Protection Commission (DPC) audit (PDF) of Facebook, the cookies that are set and the data required by these plugins can differ. They appear on other websites through the use of "iframes", a very common way of embedding content on to a web page. These are tools that link back to Facebook in some way, such as the "like", subscribe" or "recommend" buttons. The tracker we are seeing in our data is, most likely, from Facebook's " social plugins". In fact, Facebook explicitly told us it has no need for such a thing – the information its users willingly volunteer on the platform is a far richer resource for advertising. The Facebook tracker that appears in our data is not for targeted advertising.
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