You want knowledge sharing... look at the markets.

A lot of posts have recently been about prediction markets, and I guess it is because of my background in finance However, the thing about markets is that if they are allowed to work freely they are one of the easiest ways to share knowledge. This is also obvious from the statement by Ed Faubert in this article from fastcompany

To the untrained eye, the coffee futures ring is a pretty unlikely arrangement: 250 people hopping up and down hysterically. Looking down on the tumult from the eighth-floor gallery at the New York Board of Trade (NYBOT) in Lower Manhattan, however, Ed Faubert sees only order. "It's the collective wisdom of the entire coffee world asserting itself," he says. "All the coffee knowledge on the planet at this moment is being channeled into one place. Co-op farmers in their fields in Guatemala are monitoring what's going on with pagers; there are people in Japan calling in contracts in the middle of the night. It's amazing how well it works."
...
As with other commodities, the process of "discovering" the daily price for coffee is built on hand signs and even lip-reading; each contract accounts for 37,500 pounds of the estimated 16 billion pounds of coffee grown annually worldwide. Faubert and the other 47 NYBOT-licensed cuppers determine which coffee gets sold at the open-market price and which at a punitive discount because of inferior quality. So when the traders in the pit that morning were buying arabica futures for March 2007, they were betting not only on the size of the October 2006 harvest in, say, Antigua, Guatemala, but on what Faubert and his fellow cuppers would think of it.

finally this comment about Vietnams entry into the coffee market:

The Vietnamese "strategy," Faubert explains, was to dump 16 million bags of low-quality robusta into a world market with only 1.2% annual growth, promptly crushing the world's robusta price: "They haven't entirely figured out capitalism yet"