Author Rank – rel=”author”
rel=”author” attribute was announced in Sept 2011 announced.
Matt Cutts discussed the implications in an interview shortly after.
The web is potentially an anonymous place where anyone can show up, leave a comment and you do not really know who wrote a blog post. By adding a rel=”author”, Google can tie together all the author’s content.
For the moment it is only on-site but in time it can apply to multiple sites. Eventually authority authors will be recognised and even if their guest blog post carries few links, the post will be boosted in the results pages.