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A close-up view of the logo for the microblogging website Twitter.
John Moe of The Marketplace Tech Report joins Madeleine as he does every Thursday to run down the top tech stories of the week: Amazon is launching a new smartphone app, called Price Check. You go into a store — an actual physical bricks-and-mortar store — find an item, scan it and the app will show you the price on Amazon.com. Then, Amazon will knock an additional 5 percent off that price if you buy it using the app. Hulu is looking at adding facial recognition technology, so you can click on an actor's face and get a pop up of their Wikipedia entry so you can learn more about them and find their big roles. And twitter's top hashtags of the year.