You CAN scale trust, but you have to do it by ??? get this ??? trusting people to spread trust one by one, two by two. You must make it part of their required work behavior to network/share/learn.
I particularly like Gia’s comment that “if an application was built for the people who need reports on the data within, and not for the people responsible for supplying the data”, it is far from achieving the goal of Enterprise 2.0.