Meanwhile, PayPal acquires mobile payments firm Paydient.
The booksellers today began doling out credits as part of an antitrust case settlement against several publishers.
Amazon.com Inc. and Barnes & Noble Inc. have sent consumers who bought its e-books between April 1, 2010, and May 21, 2012, an e-mail alerting them that they have received a credit as part of a settlement between some of the largest U.S. book publishers and a coalition of state attorneys general.
The states claimed that five publishers—Hachette Book Group Inc., HarperCollins Publishers Inc., Simon & Schuster Inc., Macmillan Publishers Ltd. and Penguin Group USA LLC—and Apple Inc. colluded to artificially inflate e-book prices.
Amazon customers can apply the credit to either Kindle e-books or a print books sold by Amazon.com. Similarly, Barnes & Noble customers can apply the credit to the retailer's e-books or print books.
Amazon is No. 1 in the Top 500 Guide and Barnes & Noble is No. 27.