I just started to learn OpenSocial. First of all, I organized terminologies.
Gadgets API Reference
OpenSocial - a subset of Gadget
A set of common Application Programming Interfaces (APIs) for web-based social network applications, developed by Google and a number of other social networks. Applications implementing the OpenSocial APIs will be interoperable with any social network system that supports them.
- The user who has installed the app
- The user who is using the app
- Relationship between two users
- OpenSocial App
- A Gadget Specification compliant
- App Data
- Data stored by an app
- Data stored by a user (what a user does)
- A website