You have a former Obama campaign staffer saying that what they did raised alarms with Facebook. Hence, what they were doing was not OK by someone’s standard. Plus, the intent of the app is irrelevant. By using it you authorized it to get information on everyone in your friend list, something they’ve since disabled for, wait for it, privacy reasons because it’s not like the people on your friend list were ever asked for _their_ consent during the harvesting process.