Hot topic: Twitter, Book Blogs, and many book review sites are discussing new FTC guidelines re disclosure of free products, books, etc. given by publishers, authors, publicists and others, in exchange for an "endorsement" of said products.
It seems a bit complicated to me, but here's something from the FTC.
FTC Publishes Final Guides Governing Endorsements, Testimonials
Changes Affect Testimonial Advertisements, Bloggers, Celebrity Endorsements
"The revised Guides specify that while decisions will be reached on a case-by-case basis, the post of a blogger who receives cash or in-kind payment to review a product is considered an endorsement. Thus, bloggers who make an endorsement must disclose the material connections they share with the seller of the product or service."
( from FTC Guides)
I'm already trying to comply by saying that an ARC or review book was provided by the publisher/author/publicist and hope that will satisfy the requirements. By the way, the guidelines won't take effect till Dec. 1 and probably only where the FTC has jurisdiction - the U.S.