Social media has profoundly changed society over the past decade. It has enabled new forms of widespread collaboration and communication that have influenced major world events like the Arab Spring, the Japanese earthquake and tsunami, Occupy Wall Street, and political scandals. The rise of social networks like Facebook and new technologies like smartphones have given billions of people the ability to instantly share information and perspectives online. This level of connectedness and the new dynamics around how news and ideas spread digitally continue to reshape our world in fundamental ways.