As a speaker, is it better to be an expert or an entertainer?

With the hundreds of social media events going on around the country every month, each with a bevy of speakers, communications pro  Arik Hanson wonders whether being a social media speaker is even a credibility builder any more. He also muses about being a subject matter expert — is it better than being an entertaining speaker. Know who his favorite speaker is? You may be surprised. — Claire Celsi