@Jojothegoodperson @louis Facebook's attempt to expand their data collection to people that don't use Facebook: https://en.wikipedia.org/wiki/Shadow_profile

The short version is that they pushed all these little embeds (same thing Twitter does), like you see those "Like us on Facebook" buttons on random websites? Facebook uses those for data collection. So even if you didn't use Facebook, they'd follow you around the web and collect data on you.