Martin Plonka has created this poster that classifies typefaces by seven major groups: Slab Serif, Serif Old Style, Serif Transitional, Serif Modern, Sans Humanist, Sans (Neo)Grotesque and Sans Geometric. The typefaces are positioned radially using one of the stereotypical / popular data visualization methods
One thing I am noticing with infographics is that designers are trying to put too much on one page, making the font smaller and harder to read. Even when you go to the original infographic and zoom in you can barely see anything! Definitely need a better hierarchy of importance or be more selective with the data they chose.