Social networking is a daily activity for most of us. Anyone paying attention knows that sites like Facebook and Twitter have hundreds of millions of users and are extremely popular. But one thing I think we all forget from time to time is that these social networking sites are businesses. They do have employees and they do have costs. So I ask again, how do social networks make money?

This infographic from USBundles shows how the most popular social sites have become successful businesses, while still serving up those check-ins and live-stream videos you love. Through its Venn Diagram, this infographic shows the multiple ways social networks make money.

Take a look at the infographic below to see for yourself how social brings in revenue: