Maximum PC: "Blocking third-party cookies is one way of preventing advertisers from stalking you online, but the onus to do so is mostly on the user, as the top three browsers all allow third-party cookies by default. Very soon, this will change as far as the hundreds of millions who use Firefox are concerned because Mozilla is all set to change its cookie policy."
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bad for advertisers and the network of information harvesters that want to profit off user habbits.
I'm keeping ghostery though. Some sites have unbelievable amount targeted at you.