• Your weak business case: Even though it has the measurability advantage of being an online medium, it is challenging to quantify the benefits of Twittering in C-level exec terms like revenue or leads.
• It is lonely at the top: Other than a small selection of high profile execs, most are not using social media (and if they are it is something practical like LinkedIn).
• Technology adoption: If your boss is not an early adopter or part of the early majority, there are very few convincing arguments for social media.
• Bigger fish to fry: We all know the sour economic environment is affecting business.  Chances are your boss is more concerned about meeting monthly numbers and keeping his/her job than “cool new opportunities”.
• Difficult to quantify ROI: Unless you are closing business or generating leads from social media, it is pretty challenging to build an economic case.  While community building and customer engagement are important, ROI is top of mind.  Given the
• Your boss has no friends:  Just because everyone you know is on Facebook or Twitter doesn’t mean that this is true for your boss. Your boss’ peers or friends may not be using social media.  Check out this research by the Pew Internet & American Life Project to see how social media use declines in older demographics.

Can you think of any others I missed?