It appears as though accused Russian spy Mikhail Semenko was an active social networker.  Semenko and his comrades are a case study in espionage 2.0.  He had accounts on LinkedIn and Facebook.  He even ran a blog on the Chinese economy.  What are the lessons here?  Well, first, you should know who you’re connected to on these social networking  sites.  A Facebook news feed could have been a great source of intelligence for Semenko, if he was friends with the right people–say, a congressman on the right committee who posts a little too much on his Facebook account or even a mid-level civil servant working in a sensitive national security position.  It seems hard to believe, but…