[sp332]

I already find tons of stuff I didn't know on Google! More, seriously, advertisers already "target" ads based on such loose parameters as age or location. Let me set my age as a filter if I want to, then you can show me those ads. Pinterest is starting to monetize people browsing semi-aimlessly through pages of tangentially-related items. This could just be a variation on that.

[divegeek]

Actually, with Google, advertisers don't target anyone, really. They have a few knobs to tweak, but mostly it's Google that does the targeting, based on much smarter (but not yet smart enough) algorithms.