Pinterest gave us all access to its Lens tool last March. In May, the company added some new foodie options, including a way to find recipes based on photos of your meal. It's basically a reverse image search that helps you shop for stuff you see on the crafty network. Lens has been pretty successful, too — so much so that Pinterest made Lens as important as Search in its mobile app. Now the company is expanding its visual search tool wia an exclusive partnership with tech-savvy retailer Target.