The NationBuilder iOS SDK by NationBuilder is the official iOS client for working with the NationBuilder API. NationBuilder is an open platform for users to create online communities centered around issues relevant to them. Useful to communities, government, or independent organizations, the NationBuilder API helps developers create community organizing-driven applications by integrating various service endpoints such as information on people, campaign data, donation data, and more.
Popular social check-in service Foursquare is going through some changes, and the most important of those is that the old v1 API is going dead, as we've known since March. Older apps, especially abandoned ones, will stop working then, as will any newer app that hasn't yet upgraded to the new API.