Can online social networks help you at work?

David Coursey does not appear to be to happy about online social networks. I must admit, I participate in LinkedIn, Ryze and Company of Friends and have not made tons of real CASH. However, the professionals I know and have met in these networks, mailnly Company of Friends has been wonderful.
I now have contacts for so many professional services. Not just services, but professionals I can call upon to aks for advice.
So, does social networking help? Yes. Is it perfect? Does it have its problems? Yes.