One of them is fueled by a $2 million investment and embarked on a plan to establish community news network in 50 American cities. Another is a south Los Angeles site serving a neighborhood just 1 square mile in geography. One has been in the community news business for six years; another is just now starting to monetize his site.These were among the news sites represented at Friday’s “Entrepreneurship and the Community Web” conference at the University of Southern California. To my knowledge, anyway, it was the first time a large group of community news sites had ever gotten together……