Social networking as we know it is changing (already). Look no further than Visa's Business Network on Facebook.
It isn't just about connecting a large number of people - its about creating viable platforms to exchange, listen and learn. Businesses are using social platforming as a cost effective way to build a marketing strategy. This is particularly true in SMB's. These tools derive value from the ability to engage customers in an authentic and meaningful conversation.
It obviously begins at the individual level. A friend of mine connected me to friendfeed - which is a basically an aggregator of all social networking sites. It gives you ongoing access to all the tools in the social tool-box (linkedin, digg, f-book, twitter, stumbleupon, etc...).
Check it out - these are the folks who created google maps...