definitions

Widget:   In computer programming, a widget (or control) is an element of a graphical user interface (GUI) that displays an information arrangement changeable by the user 

FOAF: Friend of a friend (FOAF) is a phrase used to refer to someone that one does not know well -- literally, a friend of a friend. 

Perpetual beta: Perpetual beta is a term used to describe software or a system which remains at the beta development stage for an extended or even indefinite period of time. It is often used by developers in order to allow them to constantly release new features that might not be fully tested. As a result, perpetual beta software is not recommended for mission critical machines. However, many operational systems[who?] find this to be a much more rapid & agile approach to development, staging, and deployment. 

Simplicity: The degree to which a system or component has a design and implementation that is straightforward and easy to understand 

AJAX programming: jax (shorthand for asynchronous JavaScript and XML[1]) is a group of interrelated web development techniques used on the client-side to create interactive web applications. With Ajax, web applications can retrieve data from the server asynchronously in the background without interfering with the display and behavior of the existing page. The use of Ajax techniques has led to an increase in interactive or dynamic interfaces on web pages 

Usability: serviceability: the quality of being able to provide good service

Wikis:A wiki is a website that uses wiki software, allowing the easy creation and editing of any number of interlinked (often databased) Web pages