  Many altmetric studies analyze which papers were mentioned how often in
specific altmetrics sources. In order to study the potential policy relevance
of tweets from another perspective, we investigate which tweets were cited in
papers. If many tweets were cited in publications, this might demonstrate that
tweets have substantial and useful content. Overall, a rather low number of
tweets (n=5506) were cited by less than 3000 papers. Most tweets do not seem to
be cited because of any cognitive influence they might have had on studies;
they rather were study objects. Most of the papers citing tweets are from the
subject areas Social Sciences, Arts and Humanities, and Computer Sciences. Most
of the papers cited only one tweet. Up to 55 tweets cited in a single paper
were found. This research-in-progress does not support a high policy-relevance
of tweets. However, a content analysis of the tweets and/or papers might lead
to a more detailed conclusion.
