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Facebook takes shopping social

Building on its still-in-testing "Buy" button for News Feed ads, Facebook's created a "Shopping" tag on Pages that lets a selection of retailers list items, with a trial set for a limited number of users.

It's also updating its Canvas ads platform for mobile, which will also support buyable products (shown below): "After clicking on an ad, people will see a fast-loading, full-screen experience where they can browse through a variety of products, before going to the retailer's website to purchase," the 'Book says.