Having considered the use of Facebook to capture potential voter data in Social Voting, I was disappointed to find an American report that describes how their citizens are being disenfranchised due to lack of the correct identification. The paper, The Challenge of Obtaining Voter Data, may not be appropriate in the UK but still contains some salutary lessons in not what to do if you want people to vote! Written by Keesha Gaskins and Sundeep Iyer, and published by Brennan Center for Justice at NYU School of Law, at 40 pages of PDF at 1.35Mb it is a very thorough exercise.