title: If I tweet will you cite? The effect of social media exposure of articles on downloads and citations.
abstract: OBJECTIVE
  We sought to investigate whether exposing scientific papers to social media (SM) has an effect on article downloads and citations.
  
  
  METHODS
  We randomized all International Journal of Public Health (IJPH) original articles published between December 2012 and December 2014 to SM exposure (blog post, Twitter and Facebook) or no exposure at three different time points after first online publication.
  
  
  RESULTS
  130 papers (SM exposure = 65, control = 65) were randomized. The number of downloads did not differ significantly between groups (p = 0.60) nor did the number of citations (p = 0.88). Adjusting for length of observation and paper's geographical origin did not change these results. There was no difference in the number of downloads and citations between the SM exposure and control group when we stratified for open access status. The number of downloads and number of citations were significantly correlated in both groups.
  
  
  CONCLUSIONS
  SM exposure did not have a significant effect on traditional impact metrics, such as downloads and citations. However, other metrics may measure the added value that social media might offer to a scientific journal, such as wider dissemination.
authors.affiliation: Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland. thomai.tonia@ispm.unibe.ch.
authors.forename: Thomy
authors.initials: T
authors.lastname: Tonia
authors.affiliation: Public Health and Surveillance, Scientific Institute of Public Health, Brussels, Belgium.
authors.forename: Herman
authors.initials: H
authors.lastname: Van Oyen
authors.affiliation: Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland.
authors.forename: Anke
authors.initials: A
authors.lastname: Berger
authors.affiliation: Swiss Tropical and Public Health Institute, Basel, Switzerland.|University of Basel, Basel, Switzerland.
authors.forename: Christian
authors.initials: C
authors.lastname: Schindler
authors.affiliation: Swiss Tropical and Public Health Institute, Basel, Switzerland.|University of Basel, Basel, Switzerland.
authors.forename: Nino
authors.initials: N
authors.lastname: Künzli
mesh_terms: D015706:Bibliometrics; D006801:Humans; D010506:Periodicals as Topic / Q000706:statistics & numerical data*; D011634:Public Health; D061108:Social Media / Q000706:statistics & numerical data*
keywords: Bibliometrics; Citations; Downloads; Facebook; Social media; Twitter