As we've noted recently, m-commerce is really taking off on mobile devices. Now research firm Nielsen has tracked the most-used shopping apps for smartphones in June based on their unique audience and the average time spent using the app during that month.
The number one smartphone app for shopping is, not unsurprisingly, eBay Mobile. With a unique audience of more than 13 million, the app commands more than an hour of users' time per month (US consumer numbers).
In a relatively close second is Amazon Mobile, with a unique audience of over 12 million. Time spent using this app is less than 20 minutes on average, however.
And in a close third is Groupon, the biggest daily deal site. With an audience of just under 12 million, users spend an average of 21 minutes on this app per month.
Rounding out the top five is Shopkick and LivingSocial. What's interesting here is that Shopkick, which rewards users for shopping in brick-and-mortar stores, is by far the biggest timesink of all the apps—its 6.5 million users spent an average of more than three hours on it in June! LivingSocial's 4.4 million users, meanwhile, averaged a total of less than 10 minutes.