IMHO, Ghostery does a terrific job of tracking blocking.
But not everybody agrees with me.
My two cents worth, Ghostery.
It does, but Ghostery only blocks tracking programs and scripts. Those scripts can remain latent in a browser session and "follow" you.
The "Do Not Track" option in most modern browsers is a flag provided to a web provider that essentially asks that they not pay attention your ingress and egress with their site. It's a gentleman's agreement, nothing more. There's nothing to stop a site operator from tracking your IP ingress and egress from their site. They know from where you came and to where you're going when you leave their site. Do not track just "asks" that they not catalog your information. It does not need to be heeded.