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Forever cookies are pretty bad. I know someone made a library as a proof of concept, but yeah, don't actually use this.

• majke 14y ago
  This one? http://samy.pl/evercookie/ http://samy.pl/evercookie/ Can you explain why one shouldn't use this? Is there a law in US forbidding using Etags for cookies?
  • krichman 14y ago
    There's morals and ethics which should forbid it.
  • olalonde 14y ago
    Well, it seems KISSmetrics just had to pay 500K$ for doing just that. That being said, I'm also wondering which specific law they broke.
    • gyardley 14y ago
      They broke the one that says 'class action trolls are expensive and time-consuming to deal with'.
  • phpnode 14y ago
    I find evercookie a really hilarious example of unintended consequences. I think when the author released it he thought there would be so much uproar that browser vendors would rush to plug all the gaps. But they didn't, so evercookie remains an absolutely awesome tool for unethical marketing companies - he handed it to them on a plate.