XING informed me that they will close their API on March 31st for good (privacy concerns yada yada). I knew this could happen anytime, it has happened to me before with Facebook and LinkedIn for the same reasons (allegedly). But this really hits me hard because the vast majority of my users used the app to get a hold of their XING connections. So I am not sure how to proceed. The remaining functionality of the app is not zero, but I am not sure the cash it might still make warrants the energy to keep the app alive. So, for the moment I will turn to other projects (of which there are many).