Yesterday, Google annouced FriendConnect, their answer to MySpace Data Availability and Facebook Connect. These services will allow users to securely access social networking features, including friend lists, profile information, etc.. to  third party applications. The eventual goal of these services is to allow users centralized access to all their social information.

So which service will reign supreme? Time will tell. On the business side, MySpace and Facebook have much larger communities (100M and 70M respectively), which means most integrations will be focused on these two services. 

On the technical side, it seems Google's service is somewhat lacking. Where Facebook and MySpace are allowing users direct acess to information via an API, Google will be serving up data through an iframe, which means less control for the developers.

For Google to catch up, they need the pendulum to swing in their favor. By spearheading projects such as OpenSocial and Social Graph they are appealing to the developer community, but until they get the average user on their side, they will be playing second fiddle.