Interesting point in The Corporate Executive Board's Executive Guidance for 2010 (http://www.executiveboard.com/2010guidance/index.html)
As social media becomes a bigger and bigger part of companies' business strategies, more and more of the information being created and shared is outside core IT platforms such as ERP and CRM systems. It's not surprising that this information can neither be found nor used.
The scale of this problem is extraordinary. An average knowledge worker creates between one and two gigabytes of content both at work and at home each year. Much of this information is unusable by businesses because very little is captured or controlled. As much as 68% flows through corporate channels such as e-mail and 17% through "non-corporate" systems such as Twitter, Gmail and Facebook.
The downside is twofold: failure to capture vital information within the business and the loss of sensitive information outside the business.