[Tossrock]

Yeah, I thought that this line:

> "They know everything we click and like on their site, and know who our closest friends and relationships are."

was actually a big understatement - due to the ubiquity of the share button, which (as many HN readers know, but many average internet users do not) tracks logged in (edit: and also logged out) users, they also know a decent approximation of everything, done by everyone across the entire internet.

Now, it may be ironic, but it might also be poetic justice if something being shared over Facebook ultimately weakened it. Imagine a virally-shared post encouraging people to take a deletion pledge in 5 days by sharing it. They could use the intervening 5 days to get contact information, and establish what kind of relationship they'd like to have with the people they actually care about on there.

[jjeaff]

>tracks logged in users

It also tracks logged out users. Assuming you didn't log out of Facebook AND clear your cookies. Logging out of Facebook merely marks you as logged out. But the cookie remains and they use it to track all the sites you visit.

[eecc]

Just curious, but blocking third party cookies would also stop the tracking or it uses some server-side library to embed the cookie in the site’s domain?

[inlined]

JFC. How does logging out of Facebook revoke all OAuth tokens for linked accounts on that machine but they still leave a token to track your movements.