Journal of medical Internet research (2011). Volume: 13, Issue: 4. Pages: e123. Gunther Eysenbach et al. Citations in peer-reviewed articles and the impact factor are generally accepted measures of scientific impact. Web 2.0 tools such as Twitter, blogs or social bookmarking tools provide the possibility to construct innovative article-level or journal-level metrics to gauge impact and influence. However, the relationship of the these new metrics to traditional metrics such as citations is not known. Published using Mendeley: The research tool for desktop & web - Mr. Gunn