Top 10 most frequently challenged books of 2013.
From the Guardian:
Captain Underpants (series), by Dav Pilkey
Reasons: Offensive language, unsuited for age group, violence
The Bluest Eye, by Toni Morrison
Reasons: Offensive language, sexually explicit, unsuited to age group, violence
The Absolutely True Diary of a Part-Time Indian, by Sherman Alexie
Reasons: Drugs/alcohol/smoking, offensive language, racism, sexually explicit, unsuited to age group
Fifty Shades of Grey, by EL James
Reasons: Nudity, offensive language, religious viewpoint, sexually explicit, unsuited to age group
The Hunger Games, by Suzanne Collins
Reasons: Religious viewpoint, unsuited to age group
A Bad Boy Can Be Good for a Girl, by Tanya Lee Stone
Reasons: Drugs/alcohol/smoking, nudity, offensive language, sexually explicit
Looking for Alaska, by John Green
Reasons: Drugs/alcohol/smoking, sexually explicit, unsuited to age group
The Perks of Being a Wallflower, by Stephen Chbosky
Reasons: drugs/alcohol/smoking, homosexuality, sexually explicit, unsuited to age group
Bless Me Ultima, by Rudolfo Anaya
Reasons: Occult/Satanism, offensive language, religious viewpoint, sexually explicit
Bone (series), by Jeff Smith
Reasons: Political viewpoint, racism, violence