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Using Google, first results I found are about the movie; followed by results on Amazon for purchase of the book, then some fan pages of the books. Considering that Hunger games is originally triology, there are more aspects related with the original sources that are beyond literature (business, entertainment etc) that contribute to our understanding and knowing the book online. When searching using the Image function, I found that the majority of results are of the movies ; whereas if search for a book that does not have a movie version, the cover of the books are among first image results (The Alchemist). 

Both the book and the adaption has attracted attention; one common concern for both versions is whether the sequels are appropriate for children regarding the exposure to violent, but it seems even more of a concern because the influences of a movie and a book are obviously different,  and that it was actually rated PG-13. This has attracted most attention for educators and parents. There have been a lot topics on how The hunger games can be taught and discuss in schools. There are also debates on issues that seem to only relevant to the adapted versions of the book (the casting which leads to issues about racism and obsession of body image...)

 Some statistic for the prevalence of the book and movie on the internet: http://mockingjay.net/2012/12/20/hunger-games-trilogy-dominates-web-searches-trends-2012/

Then I search for it online but in a different language - it would be interesting to look at the book from a different point of view - of people in the country where it didn't come from and where its popularity didn't level up with that in the U.S. Interestingly, among the first results are more about the book and discussions of the series (how the ideas are relevant in a global context), more than about the movie (perhaps because the movie was censored)