Social media service Facebook on Monday introduced a revamped iOS Dev Center and a upgraded version of its Software Development Kit (SDK) for iOS app developers. The SDK, now at version 3.2, focuses on providing better mobile analytics -- including app usage metrics, ad optimization and purchase event logging. The update also brings in better error handling, improved web dialog support and the addition of a new FBAccessTokenData type to its API. The improvements, the company says, will make it easier to build, distribute and promote FB-enabled apps.