username223

I recently became aware of the ETag trick for preserving cookies even after people delete or block them, and was simultaneously impressed and disturbed. But that was the state of the art two years ago.

If Ghostery works the way I think, it will stop this approach. Does it? And what is the state of the art in the arms race between trackers and blockers?

you do not see legitimate or big players use this technique, but occasionally we do run into the use of them.

A number of popular sites, including Hulu and Slideshare, were caught using KISSmetrics, which used this technique. Presumably the bigger players could just buy the data from KISSmetrics, maintaining a level of deniability.

I've not used a single sock puppet in this entire thread.

Okay. Please let us know which sock puppets you use in other threads.