This summer, I watched the Olympic Games while using Twitter. I think it was key to feeling a big sense of loss once the Games were concluded. This is because so many of the athletes were in contact with their fans.
For the just completed election, i think the same dynamic was at work. I particularly was on Twitter for the debates.
There is an interesting infographic that provides global observations about the use of social media in politics. It would be more interesting, however, if the next level of data (those closer to identifying which social media platform is most used) would be even more informative.