This was the wording on the Twitter feed:
"Hunger Games Trilogy Beats Harry Potter Series To Become All-Time Bestselling Book Series"
Wow! That's an amazing feat given the popularity of the Harry Potter series and the fact that the Hunger Games, though captivating at first, apparently petered out. (I only read the first book and was greatly impressed with the writing and story until about two-thirds of the way through, and then got bored. Other people who have read all three said the second book was better, but that the third was terrible. DC told me to not even read the second because that would force me to read the third, which was a total waste of time.)
Anyway, the following are the first two paragraphs from the story linked to in the Twitter feed.
Although author Suzanne Collins only wrote three books, her Hunger Games trilogy has been able to zap the magic out of J.K. Rowling’s seven-part Harry Potter franchise on Amazon.com,. Taking into consideration print and digital Kindle book sales combined, The Hunger Games, which are much shorter reads than the Potter books, have captivated a wider range of fans around the globe. All of the books in the Hunger Games and Harry Potter series are available for Kindle owners with a Prime membership to borrow for free in the Kindle Owners’ Lending Library.
“Since debuting in 2008, Katniss Everdeen and the Hunger Games have taken the world by storm, much as Harry Potter did a decade before,” said Sara Nelson, Editorial Director of Books and Kindle, Amazon.com. “Interestingly, this series is only three books versus Harry Potter’s seven, and to achieve this result in just four years is a great testament to both the popularity of the work and, we think, the growth in reading digitally during that time. Customers love these books and all three titles are consistently on our Top 10 lists in both print and Kindle formats, and The Hunger Games is also the most-borrowed book in the Kindle Owners’ Lending Library.”
Got that?!? It's only from sales of both physical books on Amazon.com and Kindle sales, as well as the free loans of Kindle books to Amazon Prime members that are included in the count. The first Harry Potter book was published in 1999, far before the average reader bought their books from Amazon, and the Kindle wasn't even around. Since then, the largest bookseller (Borders) has gone out of business.
Many of the Harry Potter books were also purchased at bricks and mortar stores because people wanted to purchase the books at midnight the day they were released. There wasn't that same excitement for the Hunger Games books.
Lastly, Kindle and the Amazon Prime free lending were not even available for many of the HP books, which offered a more convenient and less expensive forum for reading books like the Hunger Games.
Let's compare sales of all books from all retailers, not just one. I would also like to see the total real sales from all books in both series. My guess is that J.K. Rowling wins hands down.