Editors’ note: A few weeks ago, HBR asked members of the Poptech Social Innovation Fellows to tell us their management challenges in running socially minded businesses. Our goal in doing so was to expose these challenges to you — the HBR.org community — with the hopes that the community could assist these challenges via conversations in the comments area. We ran two posts this week from the fellows, and here is the third — a mash-up of sorts, with excerpts from a variety of the fellows’ responses. Later this week, we’ll be blogging from the Poptech conference itself.