Because they'll log the data of who logs into what, when, then sell it. So you want your adwords for a new website called "frameworkoftheweek.com" (which surpr

Because they'll log the data of who logs into what, when, then sell it. So you want your adwords for a new website called "frameworkoftheweek.com" (which surprisingly is not registered at this instant) to only appear to people who log into HN at least once per week because they'd be the ideal target market. And google says "OK we can do that". Or you own a local supermarket and you want your adwords for "cucumbers on sale" or whatever to appear ONLY to people to log into your local hometown newspaper, because they almost certainly live there. Heck why not try the logical union operation of the local hometown newspaper, every small local bank and credit union, anything else that's local and has an account system. In a way I'm not bothered. 99% of ads are useless to me so I block them. These ads might actually be useful to me. Ads that don't suck are an interesting thing to think about. Of course we've been promised that everything from the blink tag to popups was the magic bullet that would make ads not suck, yet they sucked anyway.