The Google Analytics 'trick' (to identify all the sites someone owns) has been around for quite a while. All you have to do is use a code search engine like pub

The Google Analytics 'trick' (to identify all the sites someone owns) has been around for quite a while. All you have to do is use a code search engine like publicwww to search for the snippet of code or the analytics ID. It's not just the Google Analytics ID or GTM Id, you can also use the Adsense pub-id or just about anything else that you might think sites have in common. When you start to also look at backlinks and IP neighborhoods, things can get interesting, as well.