Actually, you'd expect the Winklevosses, of all people, to get this, because in a way money is like a social network, which is useful only to the extent that other people use it.
The words and the references are really useful only to people who have had the same experiences and use the same vocabulary: those references are to a shared basis of sensory experience and a shared language.
Of course, online resources are useful only to communities with Internet access.
It's why engineers design products ultimately useful only to other engineers.
Books are not simply "content delivery devices," useful only to fork information onto an ever growing pile.
It's dead, sticky and wet, it sucks you down, nothing grows in it, it's useful only to the potter.
Initially, the change will be useful only to newer long-distance airliners and corporate planes, which often fly very high.
While the service may be useful only to full-fledged sports fanatics, it's at least a baby step toward the integration of wireless technology with entertainment content.
Six Degrees is likely to be useful only to people who organize and name their files in the fairly rigid way the program recommends.
As a painter and photographer, I can tell you that projecting the picture on the canvas and tracing it is useful only to enlarge and position its components.
But therein lies a drawback: macros are often useful only to the person who has set them up and knows how they work.
