Currently most websites have a snip of code that posts to Google when a visitor arrives. The cookie there is linked to an identity and later used to push ads, and metrics for the site user. It seems like this is the thing to make broadly available. Anyone with $ can index the web. But nobody can get every websites to update to post to 2+ destinations. Multiple companies should be able to listen to that feed, and then be responsible for tracking and indexing on their own.