What's new in social media? Funny you should ask. InSites Consulting recently posted a fantastic deck to Slideshare addressing just this:
The deck is pretty long. It starts with the five "big conclusions" they reached from their research in the first 30 slides. The rest is all sorts of interesting facts and figures about the way people behave in different countries, the different platforms, emerging markets, people's current level of engagement and future plans, etc. Good stuff.