RT Journal Article SR Electronic T1 What Do We Know About Social Media? JF Journal of Advertising Research JO J Advert Res FD WARC SP 4 OP 5 DO 10.2501/JAR-54-1-004-005 VO 54 IS 1 A1 Geoffrey Precourt YR 2014 UL http://www.journalofadvertisingresearch.com/content/54/1/4.abstract AB