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Research on social media has to date assumed that all posts from an account are authored by the same person. In this study, we challenge this assumption and study the linguistic differences between posts signed by the account owner or attributed to their staff. We introduce a novel data set of tweets posted by U.S. politicians who self-reported their tweets using a signature. We analyze the linguistic topics and style features that distinguish the two types of tweets. Predictive results showdoi:10.18653/v1/p19-1274 dblp:conf/acl/Preotiuc-Pietro19 fatcat:7k7pvmfr2behtbv7wpgbgs5roq