[andelink]

Is this a legitimate institute? The linked article offers many statistics and even financial figures but cites no sources or studies. There is a “TOLL FREE” (capitalized) phone number in the website footer, and the comments are full of prostitution ads.

[ryandrake]

Wikipedia[1] contains more links to data, if you want to sample a few more sources.

1: https://en.wikipedia.org/wiki/Literacy_in_the_United_States