almighty_monkey - 12:37 pm on Mar 17, 2011 (gmt 0)
I guess the existance of an exception list makes sense.
Say, there is a big major news story, like the Japan quake. The BBC put up the story and a million bloggers, forum posts and twitterers link to it in an hour.
Without a whitelist, Google would just go 'AH SPAM!' and dump them from the SERPS.