There are lots of examples, especially at the team level, where you have people taking the initiative and bringing in software, especially for low cost or free, and they are getting value out of it. But because they are not documenting the value in any systematic way, or spreading the word about it, these tend to remain relatively fragmented, isolated instances.
Interesting, but valid point from John Hagel at Deloitte. We sometimes talk about “Return on Collaboration”, but for workforce collaboration we probably need to be thinking about this in terms of the return for the individual, the group (team, department, division, business unit, etc) and ultimately the whole organisation. The question is then, for a particular tool is everyone getting their fair share of the return?