[gojomo]

I think someday that hack will be closed in the browser as a privacy violation, so I would be hesitant to build a business based on it.

[paraschopra]

I started to build exactly the same a couple of months back but then abandoned the project because a business on a hack is risky!

[jjfarren-]

We had considered the same issue, but decided to give it a try anyway.

[jjfarren-]

Apart the visited link way there are also other means of achieving the same result even working server side. Check out this paper http://wozad.com/docs/sp3.pdf ,it's covering also the privacy issues.

[agentbleu]

but hang on, before you get all up in arms about privacy and rights, this is a possible google adsense / adwords killer and there is going to blood shed before privacy gets in the way of profits.

[tptacek]

Yeah, because no way could Google have figured out how to do this.

[jamesjyu]

Google should really also integrate this hack into google analytics -- that way they can give rough estimates of where else your traffic is surfing.

[tptacek]

I believe there's something in Google's S-1 filing that might technically prohibit them from doing this.

[jjfarren-]

Surely they also look at your browsing history, when you use Chrome, or even when you use their search engine.

[tptacek]

Surely you haven't even looked at Google's privacy policy, which spells out exactly how they don't do this with Chrome.

[agentbleu]

btw I like it!