The internet has been hailed as a leveling force that is reshaping activism. From the Arab Spring and Occupy Wall Street to Black Lives Matter and #MeToo, digital activism seemed cheap, fast, and open to all. Now this celebratory narrative finds itself competing with an increasingly sinister story as platforms like Facebook and Twitter—once the darlings of digital democracy—are on the defensive for their role in promoting fake news. While hashtag activism captures headlines, conservative digital activism is proving more effective on the ground. 

The Revolution That Wasn’t identifies the reasons behind this previously undiagnosed digital-activism gap. Large hierarchical political organizations with professional staff can amplify their digital impact, while horizontally organized volunteer groups tend to be less effective at translating online goodwill into meaningful action. Not only does technology fail to level the playing field, it tilts it further, so that only the most sophisticated and well-funded players can…