Keywords to define

Social network – is a social structure made up of individuals or groups of individuals who are connected by a common interest, relationship or other aspect of their personal or business life. The relationships within a social network can be strong or conducted on an acquaintance basis.

Professional Development – The process of improving the knowledge of employees in a professional capability so they are more able to provide quality goods or services in their field of business or expertise. This can include on-the-job training, outside training, or observation of the work of others.
Ref.
erc.msh.org/staticpages_printerfriendly/2.2.3_gmt_English_.htm

Web 2.0 – The term “Web 2.0″ are web applications which provide interactive information sharing, online collaboration, where the user has the ability to create and design on the World Wide Web. Examples of Web 2.0 include social-networking sites, video-sharing sites, wikis, blogs, mashups and folksonomies. Users can interact and change website contents when using at site that has Web 2.0 applications.
ref
http://en.wikipedia.org/wiki/Web_2.0

blog – A frequent, chronological publication of personal thoughts and Web links.
Ref
http://www.marketingterms.com/dictionary/blog/

micro blog – is a brief message, it can be, a thought, important information, a URL, a photo or an audio clip.

wiki – A Web site that enables collaborative, it allows use many authors to work together to create content. A wiki permits users to not only access a Web site, but to edit, delete or modify the content that has been placed there. This means users are able to change the work of previous authors.
Ref
http://www.webopedia.com/TERM/W/wiki.html

mashup – In web development, a mashup is the creation of a new web service that has been created from the integration of two or more sources of functionality or data. The term mashup implies easy, fast integration, frequently using open APIs (An application programming interface) and data sources to produce results that were not the original reason for producing the raw source data.
Ref
http://en.wikipedia.org/wiki/Mashup_(web_application_hybrid)