The last few years have seen any number of social movements, many prompted through social networks. Some catch fire, and some don’t, and the role of the mainstream media is still at the heart of the matter.

Dan Kennedy  teaches journalism at Northeastern University.

Callie Crossley  hosts WGBH News' Under the Radar.

Kara Miller  hosts WGBH News' Innovation Hub.

Jon Keller  is a political analyst at WBZ.