Re:Why we don't sell ads – WhatsApp Blog
by tim333 on Monday April 20, 2015 @12:37PM
(#9409229)
It is more likely that you visited a site with 'Facebook social integration' on it.
>"When a logged-in Facebook user visits a site with Facebook social plug-ins, Facebook receives the Facebook ID and browser ID, along with the URL of the page being visited,"
>"When a logged-in Facebook user visits a site with Facebook social plug-ins, Facebook receives the Facebook ID and browser ID, along with the URL of the page being visited,"
quote from a The Verge article:
http://www.theverge.com/2015/3/31/8319411/facebook-tracking-...