“even if you’ve never registered an account on the site”
How?
It says you can check on what they have....but only if you have an FB account...
““even if you’ve never registered an account on the site”
How?”
They have a side agreement with non-FB sites. You visit that site, they collect your IP address etc and give it to FB for money. SO even if you have no FB, they get your surfing info.