indyank - 1:14 pm on Aug 17, 2012 (gmt 0)
Don't authority sites often tend to be more concerned about providing good information rather than keeping you on their website?
Their focus is on both of them. How many of those authority sites that you find on SERPS, link out? Be it wikipedia or about (I am mentioning them as I see a huge push of about.com in google SERPS and I am seeing them flooding several newer territories, those that I follow for several years now).
It is something very similar to those popular twitter users who try to keep their following list as small a percentage of the followers list.
I don't know whether Google rewards that behaviour but it is true with most of those top sites.