LinkedIn doesn't just want to help you find a job or a new hire -- it thinks it can contribute even after you're gainfully employed. The company's new LinkedIn Lookup app for iPhones (there's no mention of Android yet) helps you find and contact co-workers using criteria ranging from names to skill sets. That could be particularly handy if you're trying to find someone outside your department with the right experience, or if you're just curious about that new CEO. Think of Lookup as a lightweight, inter-office social network. It won't replace Facebook or group chat systems like Slack, but it could be the easiest way to introduce yourself to your fellow staffers.