By looking at those users who state their political affiliation on Facebook, we can see a significant discrepancy between the Democrats and Republicans
by Facebook Data Team, Nov 4, 2010
... These data about who on Facebook voted offer a new lens into the demographics and behaviors underpinning election returns. There are a few caveats, (e.g., selection bias for those who are members of Facebook and who visit frequently, reporting bias, no verification, etc.), but we believe that looking at these data across a number of dimensions offers insight into what types of people decided to vote, when they went to the polls, and which factors may have influenced the election.
Voter turnout has been a central issue during this election cycle. Would disillusioned voters stay home? Would there be an enthusiasm gap between Republicans and Democrats? By looking at those users who state their political affiliation on Facebook, we can see a significant discrepancy between the Democrats and Republicans: Dems were 3% less likely than Republicans to get out to the poll. In a number of House and Governor elections, this would have been enough to flip the vote.
We can also observe how people of different ages behaved. The figure above shows the proportion of users in each age bucket who said they voted as a fraction of the people who came to the site yesterday, broken down by political party. If you're wondering if youth today are apathetic about voting, this graph is striking proof that of this fact. The height of voter turnout peaks at 65 years of age, while the lowest turnout occurs at 18 years of age. In fact, a 65 year old is almost 3 times as likely to vote as a younger counterpart. This tracks results collected from traditional exit polls, which also show a 30% turnout gap between younger voters and older voters. Furthermore, while Democrats were able to mobilize as many young voters as Republicans, Republicans were far more successful at mobilizing older voters.