No one cares where their cell phone thinks they should eat dinner.
Too bad Gauri Manglik  only learned that after spending a year developing SpotOn, a mobile app that provided people with personalized restaurant recommendations using data generated by Foursquare . The people who used the app snubbed its suggestions. They did, however, log on regularly to check out reviews from friends and post their own.
So, less than a month after realizing that people were primarily using the product’s secondary social features, she relaunched the app as Fondu , a Twitter-like network for 175 character "bite-size" food reviews. “We took way too long to get it in front of users” and incorporate their feedback, Manglik says.
She wouldn’t make the same mistake twice. After tweaking the new app based on comments from about 100 beta customers, she started marketing it to the general public. A month later, she had thousands of users all over the world. But Manglik has no plans to let the product stagnate. “If our users tell us they want to use it in a different way, we would definitely consider pivoting again,” she said. “It’s all about building something that people want.”