Fishbrain is a social network for fishermen, but will it hook anyone?

In an age of pervasive digital entrepreneurism, there’s a social network for practically every subculture under the sun. Take Codias, for example — it’s a network for political conservatives. There’s Sermo, a forum for doctors. And HoffSpace is an internet fan club dedicated to television star David HasselHoff. But one of the fastest-growing niche networks has nothing […]