Most Commonly-Spoken Languages

I often get questions about which language is spoken most in the world.  People usually think of English, and with the rise of English as Lingua Franca, this may one day be the case.  If measured by population, however, people often forget about some of the world's most densely populated countries and the dominant language in each of them.  To put an end to some of these questions, here is a link to another infograph from Mental Floss which breaks down languages by population.

Proportional Map of the World's Largest Languages