Social networks are first and foremost venues to interact with peers.<p>If I want to talk about an RFP with a client or an app. spec. with a developer, I hit them up on email, Skype, etc.<p>That's not to say sites like Facebook don't have business value, just that to be successful, applications should be relevant to the platform they're distributed through.<p>If you want to build an app. for business use and expect adoption, Salesforce.com is a much better prospect than Facebook. If you want to share LOLcats, Facebook's where it's at.