Fred Wilson, managing partner at Union Square Ventures -- and writer of the VC blog -- discusses how his firm has tackled investing in companies that specialize in harnessing user-generated content, profile-driven services, and peer-to-peer services. Wilson also talks about the broad ways in which blogging has changed how his firm does business, helping him pick up new ideas and connect with some of the companies in which his firm has invested, including: del.icio.us, Indeed, and FeedBurner