What is social bookmarking? 

Social bookmarking is a user-defined taxonomy system for bookmark. Such taxonomy is sometimes called a folksonomy and the bookmarks are referred to as tags. Unlike storing bookmarks in a folder on your computer, tagged pages are stored on the Web and can be accessed from any computer. Marking?

What is a blog?

A personal website or web page on which an individual records opinions, links to other sites, etc. on a regular basis.

What is wiki?

A website or database developed collaboratively by a community of users, allowing any user to add and edit content.
What is authorizing software?
This term refers to software that enables the creation of multimedia or hypertext documents and presentations.