[ameister14]

""We collect information from and about the computers, phones, connected TVs and other web-connected devices users use that integrate with our Products, and we combine this information across different devices users use," Facebook wrote in the document adding that the collected information is used to "give better personalize the content (including ads), to measure whether they took an action in response to an ad we showed them on their phone"."

In other news, Google Tag Manager and crazyegg exist.