Those debating the future of Twitter and other social-media platforms have largely fallen into two opposing camps. One supports individuals' absolute freedom of speech; the other holds that speech must be modulated through content moderation, and by tweaking the ways in which information spreads. Both sides are peddling an equally dismal vision. My purpose here is to point out a logical third option. In this approach, a platform would require users to form groups through free association, and then to post only through those groups. This simple, powerful notion could help us escape the dilemma of supporting online speech. Platforms like Facebook and Reddit have similar structuresgroups and subreddits"but those are for people who share notifications and invitations to view and post in certain places. The groups I'm talking about, sometimes called "mediators of individual data" or "data trusts," are different: Members would share both good and bad consequences with one another, just like a group shares the benefits and responsibilities of a loan in microlending. This mechanism has emerged naturally ... on the software-development platform GitHub. Whatever its size, each group will be self-governing. Some will have a process in place for reviewing items before they are posted. Others will let members post as they see fit. It will be a repeat of the old story of people building societal institutions and dealing with unavoidable trade-offs, but people will be doing this on their own terms.