LinkedIn: A Billion Dollar Bet on Professional Networking [View article]
They have different business model, one advertising based, one membership-based (premium) which will probably gain momentum as more and more people sign in. Increased number of people makes the site more relevant to other loyal users and encourage them to pay for premium membership.
Google Should Deliver Its YouTube Data to Viacom in Paper Form [View article]
LinkedIn: A Billion Dollar Bet on Professional Networking [View article]