School districts across US start dropping Acellus, an online learning service that claims to serve 6,000 schools, after reports of inappropriate content on it (Jared Newman/Fast Company)

Jared Newman / Fast Company:
School districts across US start dropping Acellus, an online learning service that claims to serve 6,000 schools, after reports of inappropriate content on it  —  Schools embraced an online learning program called Acellus because it promised convenience.  Now, parents are cleaning up the mess.