As the year comes to a close, it is time to look back, before looking forward to 2010, at all of the informative and insightful blog posts that the world has created in the past 365 days concerning LinkedIn.  LinkedIn itself, while beginning 2009 at a slow start, ended the year announcing 50 million members, integrating with Twitter, a new user interface, and an opening up of their platform.  Not to mention that they refined and improved upon the most valuable piece of their social networking platform, the Advanced People Search.  Oh, and then there was the new Profile Organizer …