Tipjoy has a system of associating sites with users. Manually finding that someone owns a site is easy. Automatic authentication involves a detectable change in

Tipjoy has a system of associating sites with users. Manually finding that someone owns a site is easy. Automatic authentication involves a detectable change in the site. For example, if PG wrote a crawler to find HackerNews:ivankirigin on my blog, it would be known that I own that blog (just the subdomain though, not all of blogspot.com). The vast majority of content on HackerNews is created by non-hackernews readers. They aren't going to do anything like this. So while such a system would be useful, it would be practically difficult to make a real impact.