Social-network Cluster on Save Darfur Cause (image) University of California - San Diego Share Print E-Mail Caption The figure pictures a typical social-network cluster in the Save Darfur Cause on Facebook. The original seed recruiter is colored yellow. Of the 1,021 members shown here, only four (colored red) donated money to the cause, and the majority (71 percent) recruited no one. Credit Image courtesy of Kevin Lewis, University of California San Diego Usage Restrictions Use only with coverage of this study and with credit. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.