Organizations that want benefits from social network tools will need to make some selective, deliberate and thoughtful choices that are different from the most highly restrictive "need to know" policies. For some more high-level thoughts on the relationship between social network and the org chart, see some high level thoughts on that topic, see: http://www.alevin.com/?p=1280
There's a new study out this week that claims employees are actually more productive at work when they can take short breaks throughout the day to to surf the Internet. Should companies drop Internet access restrictions and let employees Twitter away their coffee breaks?