According to Google Trends, social media marketing as a topic if search interest recently turned nine years old (or is about to turn 11 years old, depending on when you place its origin). Facebook was opened up to the public in 2006. Twitter emerged at the SXSW conference in March 2007.
We’re now long past the days of having to “sell” business executives on the value of social media for marketing. As noted below, the practice is now ubiquitous, with almost 90% of businesses engaged social media marketing.
The questions today are more around how to evolve practices (in both content amplification and follower-building) for the maturing social media landscape, and how to best monitor results to support continuous improvement.