"Please note that the percentages in these pie graphs do not add up to 100% because the math was done by a woman.

For those of you hissing at that joke, it should be uh noted that that joke was written by a woman.

So, now you don’t know what the hell to think, huh?

Nah, I’m just kidding. We don’t hire women."

-Norm MacDonald, Weekend Update

I, too would like a source with a better breakdown.

But it’s not surprising that a computer would round up when dealing with under 0.01% on a graph.

I’m guessing it’s a rounding error with some of the entries being less than 0.01. Also it’s twitter.

I would assume that all, or most of the 0.01% are actually less than that, but no one wanted to read a bunch of 0.007% on a pie chart.