Yeah, so, I'm not really certain why I took the time to do this. If there is one thing I patently don't give a fuck about right now, it's presidential politics. Still, I need excuses to mess around with ggplot2 theming, relative neophyte that I am.
A couple of notes about the chart. First, I tried to use campaign feeds where possible, but stuck with verified feeds in all cases save one: while gathering the data, I wasn't able to find Lawrence Lessig's official campaign Facebook feed. His numbers come from the automatically generated page based on his Wikipedia entry. (If anyone finds an official page that isn't for his foundation, let me know.) I should also note that both Rand Paul and Bernie Sanders have sizable (or larger) followings on their personal/professional accounts.
Second, Twitter counts were rounded (e.g., 56.8 for 56,800; 1.5 for 1,500,000), while Facebook counts were continuous. I just snagged the numbers right off the respective sites. This shouldn't make much difference with regard to the graph.
I admit, considering the reputation he has for social networking savvy—not to mention the frequency with which his Twitter feed appears to be cited in the press—I was a little surprised to see such modest numbers for Bernie Sanders. Joe Biden's numbers also seem a little light to me.
Anyway, as in all dubious indicators of electoral viability, Donald Trump is king. Just don't be fool enough to think he has a shot.