A leaked inventory and sales report from Amazon shows that the company has pre-sold 250,000 units since opening pre-order five days ago. Mobile marketers should take note.

Cult of Android, a popular blog centered around Google’s mobile operating system, recently received leaked numbers from Amazon that show massive pre-orders for the company’s Kindle Fire tablet.

According to the leaked inventory report, Amazon has received an average of 2,000 orders per hour for the device, which combines the company’s e-reader with a mobile computing device. The Fire has only been on sale for five days and does not ship until November 15, but it may represent the first major challenger to Apple’s popular iPad.

Apple reported on Tuesday that it currently accounts for 75 percent of the tablet market. Devices from Samsung, Motorola and other original equipment manufacturers that run on the Android operating system have fared decently, but none have been able to cut into Apple’s massive lead.

The growth of tablet PCs has forced marketers to tailor their strategies to the behavior and habits of mobile users.

Brafton has reported that social media use and search are among the most popular functions of tablets.

Both of these activities provide opportunities for businesses looking to target mobile users. Social media marketing campaigns have been adopted by 73 percent of companies, Brafton reported on Monday. Meanwhile, mobile search marketing is expected to account for more than 40 percent of web marketing budgets by 2015, Brafton recently found.

Joe Meloni is Brafton's former Executive News and Content Writer. He studied journalism at the University of Massachusetts, Amherst, and has written for a number of print and web-based publications.