Challenges to social media adoption
Social media is not an IT competency. Simply put, the human interaction portion of social computing is generally not IT's strong suit. It tends to be treated as just another application to roll out instead of being integrated meaningfully into the flow of work.
The more significant value propositions of social requires business transformation. Maintaining a Facebook page and Twitter account is relatively straightforward and necessary, but it usually won't generate significant growth, revenue, or profits by itself either. The more profound and higher order aspects of social media including peer production of product development, customer care, and marketing require deeper rethinking of business processes.