On this week's Social Pros podcast, we interview +Derek Halpern of Social Triggers about why email is more effective than twitter, and the call-to-action mistakes made by almost every company.

Plus, do social media shops like +VaynerMedia have a future in the advertising business?

And, why Facebook's ad rates (CPM) went up 40% in three months.

Great episode. Check out the transcript, or listen on iTunes.

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