The authors propose a commitment-based design for small online groups, where members must regularly pledge to participate (e.g., send a message) to remain in the group—rather than allowing passive lurking. Commitment design is a promising alternative to typical no-cost membership models.
Using Commit demonstrates that requiring members to pledge participation fosters behavioral accountability, psychological safety, and group longevity, particularly in smaller, goal-oriented communities.
Participation nearly doubled: the median number of messages rose from ~8 in the control to ~17.5 in Commit.
Active days doubled: median days active increased from 5 to 10.5 out of 21.
Much stronger member retention: 87% of members in the Commit condition remained active by week three, versus only 19% in control.
Insights from Participants. Many said the commitment offered a “safe cover” to post, even when they felt shy or unsure. They also reported greater comfort, perceived accountability, and stronger reciprocity norms within the group.