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I have an idea: Use their cookies against them. Build a plugin that anonymously and randomly swaps cookie values amongst the people using it.

Could possible make use of telehash.org or like.

Would you really run the risk of accidentally letting a random person into your Facebook account?

I also think that this is a bad idea. This form of cookie sharing has been done many years ago and I don't remember the details of the story tonight. In the end it really freaked people out when they suddenly had user priviledges of other users on popular websites.

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