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I find it very ironic that people online were asking for themes and summaries about "Feed" for their school assignments. If someone were to write a summary for you, wouldn't it be just like having the feed tell you? Which is exactly what one of the main themes of the book is? That people, especially kids and teens, can no longer think for themselves? I really enjoyed this book. It really made me look at life in a different perspective. I enjoyed that even though this is way in the future, teens are still not as different as they are today. It was nich knowing thtat I could easily relate to all the characters at some level. 
http://www.commonsensemedia.org/book-reviews/feed

http://www.infinityplus.co.uk/nonfiction/feed.htm