I'm posting solely as a member and solely to add some clarification to the arguments expressing concern that TalkBoard voters' privacy is invaded because in regular elections the identification of who votes is private.
Part of my community service activities are teaching precinct workers how to conduct elections in a large city in California. The California Elections Code (sec. 14202) requires prominent posting in the precinct of the index of registered voters and it is treated at least during the time that the polls are open as a public document. Another Code section (14297) requires precinct workers to note on the index of voters that a particular voter has cast a ballot. This public process is deemed very helpful to voters, their friends, neighbors and esp. partisan campaign workers who often have volunteers at the polls checking the index of voters to see who has not yet voted. Of course, voting procedures may differ from country to country and within regions, provinces or states , but I wanted to clarify that in a large U.S. state, "who votes" is by law, quite public.