Google this week announced what seems like a great move in the social network application world called OpenSocial.

OpenSocial is a set of common APIs that will work on many different social websites, including MySpace, Plaxo, Hi5, Ning, orkut, and LinkedIn, among others. In addition, this allows developers to learn one API, then write a social application for any of those sites.

Today, MySpace also joined the Google sponsored party. So now we have a nice friendly standard to build all those social applications on, but wait, where’s Facebook? To date, the leading social network has not receive an invite.

So, is this just buzz stealing on the part of Google or is this Google (after a failed Facebook investment) and the other social sites gaining up to take Facebook on?

Rumors are swirling in this red hot category. Better pay attention small business folks, it’s not going away – fun may turn fundamental in this space.