The OpenSocial API by Google
OpenSocial is built upon Google Gadget technology. With the Google Gadget Editor and a simple key/value API, you can build a complete social app with no server at all. You can also host your application on your own servers if you prefer.
There are many websites implementing OpenSocial, including Engage.com, Friendster, hi5, Hyves, imeem, LinkedIn, MySpace, Ning, Oracle, orkut, Plaxo, Salesforce.com, Six Apart, etc..
Email : firstname.lastname@example.org