The social network, with 60 million daily users, plans to begin selling sunglasses with a built-in camera for $129.99.
The retailers shared the lead in Internet Explorer and Firefox availability tests last month.
HPShopping.com and OfficeMax.com had the best web site availability score in Internet Explorer testing among large retailers tested in May, says Compuware Gomez. Last month, both retailers posted 100% Internet Explorer availability. OfficeMax.com and QVC.com tied atop the Firefox availability rankings at 99.99%.
Sears.com and Williams-Sonoma.com (tied at 99.98%) placed next in Internet Explorer tests, followed by LLBean.com and QVC.com (tied at 99.95%).
In Firefox testing, Williams-Sonoma.com (99.98% availability) was followed by HPShopping.com and OfficeMax.com. CDW.com, Dell.com, LLBean.com, Newegg.com and Toysrus.com followed, tied with an availability score of 99.97%.
The average Internet Explorer availability score among the 22 retailers measured in May was 99.37%. The same group of retailers produced an average Firefox score of 99.21%.
Click here for the full test results.