Social networks, like real life, are driven by influencers—not necessarily those with the most friends or followers, but those whose thoughts, ideas and opinions have the biggest impact. Mr. Collegio notes that for political action committees "to seed opinion makers, Twitter is the ultimate platform. Ideas grow into stories on blogs and eventually in the mainstream media." Not the other way around.
That’s from author and former hedge fund manager Andy Kessler in an Op Ed column at the Wall Street Journal. The flow of ideas seem to be reversing; from the mainstream media to the public and now from the public--through social media networks as blogs--to the mainstream.