Effective altruism is built upon the simple but profound idea: that we can do much more to help others (i.e. save many more lives) if we simply take a more objective and rational approach to what we do with our abilities, time, and money. Is effective altruism a new form of philanthropy? Is it the best way to do the most good? Here’s some of the arguments in the effective altruism debate.

Purpose explored an important trend in business: the shift towards business models that are genuinely built around a social or environmental mission. From keynotes on shifting corporate cultures to talks on shared value to panel discussions on shifting corporate cultures and rewriting brand roles – here are the top 20, 140-character takeaways from the Purpose 2015 conference.