Literacy specialists are just beginning to investigate how reading on the Internet affects reading skills. A recent study of more than 700 low-income, mostly Hispanic and black sixth through 10th graders in Detroit found that those students read more on the Web than in any other medium, though they also read books. The only kind of reading that related to higher academic performance was frequent novel reading, which predicted better grades in English class and higher overall grade point averages.

--Motoko Rich, Literacy Debate: Online, R U Really Reading?

Further reading on reading