Where do I find data and information on how the presidential candidates use social media?
The newspapers and daily media reports usually refer to polls about this topic and the recent poll and analysis from August 2012 can be found at the Pew Research Center's Project For Excellence in Journalism (http://www.journalism.org/). The report is titled, How the Presidential Candidates Use the Web and Social Media (http://www.journalism.org/sites/journalism.org/files/DIRECT%20ACCESS%20FINAL.pdf).
For an archival tracking of social media among presidential candidate, e.g., previous presidential elections or a worldwide and multimedia coverage, I recommend Lexis-Nexis database. Select the database from our website at http://lib.sxu.edu/database. In the database search box type presidential candidates social media.