I appreciate the effort and sharing on SN. I have been thinking in what ways could it be applicable to our company.
But I see there is a psychological balance to be maintained, the onus on the user.
Unlike instant messaging which I banned, I am still open to SN. Using an email address is difficult these days, what with spam and targeted email attacks.
Besides, it is also a nightmare to create, maintain and secure a public website within the company's DMZ. The ones who can budget a $200,000 firewall are the ones whose business is really the Net.