After watching Facebook's popularity jump with the release of its applications and API, MySpace is releasing its own API for developers on February 5th. Developers can sign up here.The platform will be interoperable with Google’s OpenSocial platform, so applications written for OpenSocial will work on MySpace.
This is a smart move for MySpace. The next version of the Web, Web 2.5, is all about making your site/network as a platform. Think of MySpace and Facebook as MSDOS back in the day. Now that data interoperability is starting to happen (Microsoft is the latest to join the Data Portability Group), sites will compete on the quality of their APIs and ability to attract developers to their platform, not how many users data they keep locked up.
I can see in the future more data/infrastructure sites providing backend social networking services (profile and login via OpenID, storage, social networking software, etc)via web services for front-end sites that focus on the user experience, API and attracting developers. One day Facebook and MySpace may even outsource their storage, profile, and social networking pieces and focus on their API.