Watch the familiar brand names and their various success stories fly by in this video from Socialnomics: How social media transforms the way we live and do business
Note, of course, that every return begins with an investment, something we would be wise to remind ourselves of next time someone asks you about monetization potential.
The key element, of course, is where social media fits within your broader (and increasingly) digital strategy.
It's not about having Facebook pages and Twitter feeds. It's about having a strategy that justifies each of its component parts and, in the long run, makes your clients more successful.