I like this from Christoph.
remember the study of Dr. Robert Cialdini, in which he left three different messages at doorknobs to see if they had an effect on the energy usage of recipients:
1) Save energy to save the world
2) Save energy to save money
3) Save energy because your neighbours are doing it already
Only the third note seemed to have a significant impact on the behaviour of the people. These three notes could be translated in a business context as follows:
1) Contribute and share information to make our organization better
2) Contribute and share information to gain some sort of financial reward
3) Contribute and share information because your peers are doing it already
The trick I suppose is to make those peers visible.