In the Harvard Blogs: Not so intangible, I say. Today though it can be done in ways that were not possible formerly. In a conversation I had yesterday we discussed how even casual social interconnections were starting to be leveraged. I get several several queries a month based on topics in this blog and a few a month lead to conversations about collaboration. A few a year lead to paying topics. Efficient? Tangible.
I also see that the HBR has a Collaboration Insight Center that I had not noticed before.