Social App Features

The features you need within your social application will dictate the type of app you are going to have to build.

Feature	URL Embedded Experience	HTML Gadget	URL Gadget
Embedded Experiences	X	X
Standalone App		X	X
OAuth		X
gadget.* APIs		X	Partial Support
Container Services (Actions, Selection, Open Views)		X
Dojo / JQuery	X	X (Versions of Dojo prior to 1.7 will not work out of the box)	X
OpenSocial APIs		X
OpenSocial Templates		X