Brian Solis (@briansolis) of Altimeter wrote about the 7 Success Factors of Social Business Strategy in his ebook.
Now, you might be thinking, what does social business have to do with marketplaces? Well, it's 100 percent relevant. A marketplace is social and requires two-sides to participate. It is the evolution of sharing on social networks into a world where people share assets, knowledge and time.
How is your brand going to evolve?

We agree with Brian that these tips might seem obvious, but make sure you are considering each one of them.
"By following these seven characteristics of success for social businesses, you can and will immediately change course from just another brand, social or digital strategist trying to make sense of social media and instead demonstrating the relationship between business objectives, social technology, and the people in between."
Read the source article at Brian Solis