True, if the company only created one campaign and it was pretty specific, then yes, they could tie my signup to the campaign information. I'm not terribly conc

True, if the company only created one campaign and it was pretty specific, then yes, they could tie my signup to the campaign information. I'm not terribly concerned about this yet. Browser fingerprinting is far more alarming: http://panopticlick.eff.org/ http://panopticlick.eff.org/ Let's say there's a SASS service you can tie into that has a massive database of browser fingerprint activity. Potentially you could get quite a significant amount of browsing history once enough websites are using the service. You can tie this to an email address etc. when a site requests a signup.