They look like very different things to me
http://www.foreignpolicy.com/articles/2014/02/03/what_hip_hop_and_kendrick_lamar_can_teach_academia
These new forms of public engagement, whether on personal blogs or the Duck of Minerva or Political Violence or the Monkey Cage or Foreign Policy or EzraStan or the countless other outlets now available for online publication, are exactly where academics need to be if they want to fulfil their own educational, policy, or research missions. Online publishing actually reaches people and informs public debates that matter. The marketplace of ideas is intensely competitive, and if scholars want their ideas to compete, then they need to get out there and compete.