Dirty little secret - only 5-10% of staff will make use of social part of intranet - no evidence for this - but hear this #kmaus

Another comment that caught me attention from #KMAUS. My intention isn't to shoot the messenger here, but I do wonder if this is a misapplication of rules of thumb (like the 1% rule) and consumer Web technographics? Of course if you simply drop in 'social' as a feature on your intranet, then I can imagine that this might be the case - but not the social intranets I'm aware of or have been involved with.