X-ACR

So you block third-party cookies?

CHECK

And you opt-in to Do Not Track?

CHECK

And you run Facebook in an incognito/private window?

CHECK

And you block ads with Adblock Plus?

CHECK

So you think your privacy is protected?

WRONG

AT&T and Verizon are selling you out on your mobile device.

Verizon and AT&T (are) rolling this out: they’re tagging their customers with unique codes that are visible to third parties

Oh, and they're charging the third parties for YOUR information.

You can see what they're doing by following this link on your mobile device.

Here's what my headers look like.

If you're on AT&T you can go here and opt-out. Good luck though. It didn't do anything for me.

A detailed explanation of how it works is here.

The Electronic Freedom Foundation has this to say:

ISPs are trusted connectors of users and they shouldn't be modifying our traffic on its way to the Internet...

Amen.