12/23/2012 12:03 pm ET Updated Feb 22, 2013

Amazon Book Reviews Deleted In A Purge Aimed At Manipulation -

Giving raves to family members is no longer acceptable. Neither is writers' reviewing other writers. But showering five stars on a book you admittedly have not read is fine.

After several well-publicized cases involving writers buying or manipulating their reviews, Amazon is cracking down. Writers say thousands of reviews have been deleted from the shopping site in recent months.