After all, their purpose is to mimic our own, is it not?
And, given that people (notably, some search engine marketeers) are essentially gaming Digg   might we not see a time when just getting traffic from Digg is enough for the likes of Google to penalize someone, if search engines are able to establish a link (sort of web-based six 6 degrees of separation) between the submitter of the story on Digg and the recipient website or ‘blog.
Establish a link? But how?
Or what if Google enter into social rating of web pages? They’ve certainly got the means to do this…