Adams, Paul, MSc. Grouped : how small groups of friends are the key to influence on the social web / Paul Adams. - Berkeley, CA. : New Riders, 2012. - viii, 159 p. : ill. (some col.) ; 21 cm. - Voices that matter . Includes bibliographical references and index. ISBN: 9780321804112 Subjects--Topical Terms: Online social networks.Small groups. LC Class. No.: HM742 / .A33 2012