McLuhan would likely argue that the mere existence of corporate messaging (advertising) in social networks equates to a change in public perspective about corporations’ ability to track our every action, share these events, and leverage this information to drive our behaviors, in this case purchasing behaviors.
I would be interesting to research the impact of advertisements on social medias over time. That is to say, I’d be curious if, as the amount of exposure to advertisements increases the amount of disruption on the user experience decreases. These advertisements are just articulations within the larger social network and with their inclusion, we are forced to adopt or shift to meet their existence. These articulations will continue to develop and evolve over time, the question I can’t answer is how these developments will impact the assemblage of advertising or social media.