It is all about the moderation. Who is saying what? Who is prohibited from contributing? Who can access but can’t post? Who is on probation and must submit for approval? Who can post, but so that no one else can see their posts? Who has ultimate rights and can bypass moderation and post anytime on any topic?
Moderating the workplace community is key to success. Just be careful not to moderate too much, otherwise you risk rendering the entire community irrelevant. Today, there are service providers who provide moderation services and automation tools.
Keep an open mind, identify the barriers and keep forging ahead with Learning 2.0!