Been out of the loop so apologies if this is old;
Google's relatively new bookmarks functions for its members presents an intriquing new dimension to the algo in terms of identifying quality sites. It could be their way of fleshing out sites voted for as truly useful and content rich versus those that rank well by virtue of age and heavy SEO only. Spiders can't spot one 'quality content/user friendly site' from another, but millions of users collectively can.
What is the feeling about this possibility and it's effect on algos?