What makes for a proper book review? Reading-based social network Goodreads says reviews that focus on an author’s behavior, rather than a book’s content, don’t have a place on the site — and announced Friday that it is going to start automatically deleting those reviews.

The new guidelines are infuriating some users who say that some authors’ bad behavior online should be a factor in book purchases. And the entire episode highlights the challenges that Goodreads, which was acquired by Amazon (s AMZN) earlier this year, faces as it adds users (CEO Otis Chandler recently announced the site has over 20 million members) and becomes more influential.

A ban on “the author is an a**hole” reviews

Goodreads wants book reviews to be focused on a book’s content, not on an author’s behavior online. Until now, it had moderated reviews that seemed too personal, but those reviews remained on members’ profiles…