Spotify and Hulu, according to reports, have been caught using "indestructable" cookies to secretly spy on their users. A year ago on the Spotify Blog they were celebrating Spotify's cookies as "brilliant". They've taken the celebratory link down at Spotify, but Google's cache still has a copy of the Spotify Blog page in its cache. The original, large size copy of the poster is here.
To the user who wrote "I've had Spotify for absolutely ages now. So WHERE'S MY DAMN COOKIE?" the answer seems to be: "You had it all along and just didn't know it.
