Although the growing deluge of research data has got researchers and policy makers excited, very little data is actually being shared, according to Christine Borgman, in her as yet unpublished article The conundrum of sharing research data. She says:

"Much more is understood about why researchers do not share data than about when, why, and how researchers do share data, or about when, how, and why researchers or the public reuse data. The model and research agenda are illustrated with examples from the sciences, social sciences, and humanities."

Borgman has written related articles, which can be seen here. Other titles includes Research Data: Who will share what, with whom, when, and why? and The Digital Future is Now: What the Humanities can Learn from eScience.