José Luis Ortega has published "Academic Journals with a Presence on Twitter Are More Widely Disseminated and Receive a Higher Number of Citations" in LSE Impact of Social Science.
Here's an excerpt:
In conclusion, these results make clear that the institutional presence of research journals on Twitter is fundamental for the dissemination and visibility of their outputs. Journals should consider Twitter as an important instrument for broadening audiences and tracking the social media impact of their publications. Furthermore, these findings suggest the best strategy to promote academic journals on Twitter is to have an individual account devoted exclusively to disseminating the journal’s content.
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