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A Slam Book is a notebook (commonly the spiral-bound type) which is passed among Junior high school students. The keeper of the book starts by posing a question (which may be on any subject) and the book is then passed round for each contributor to fill in their own answer to the question.
Slam Books can also exist in virtual formats. Web based slam book sites have attracted controversy for hosting virtual slam books in which individuals or organisations are targeted for criticism that constitutes bullying or defamation
– Source : http://indiagoogler.blogspot.com