Social networking can be a powerful tool for those who are a.) working in groups b.) those who are in leadership, working with people. I don't understand why people in those situations wouldn't do everything they can to impliment Facebook, Twitter, and or blogs. They're simple to use, do not require a large amount of time, and the payoff is much higher than the cost - it seems like a no brainer.
I was involved in a group for about 9 months during the past year. As part of our group interaction, we used Twitter to help build solid friendships with one another. The point is that when using a social networking site, its to suppliment relationships built in ... well reality; not the foundation for a relationship.
One weekend a part of our team when on a trip to another city. While in-route one of his children threw-up in their van. This happened on a Thursday, and when it happened, he posted a tweet concerning what happened. Now, when we saw this friend on the next Monday, we had insight into what had happened to him over the weekend. We knew him just a little better, it helped us to understand his situation a little better.
Now, as far as the potential for connection, it only makes sense that a group or a leader would attempt to use technology in order to create a better sense of community amongst their organization. Sadly, when I talk with people in leadership positions, or people who work with groups, they are simply not interested in using this technology.