You want to write software that works just like popular social networking sites do, with lively, immediate information. That means building real-time high-frequency updates into your software, because users want their data and they want it now. In some situations, moving data in real-time is essential to the success of the app as it gives an upper hand to the business that does so. Not just that, but let's face it - it's cool to be the developer who writes the high tech websites. If you want to build these modern websites and apps with live, two-way communication, then SignalR is something you should seriously consider.