Search engine optimization (SEO) is the process of improving the visibility of a website or a web page in search engines via the "natural" or un-paid ("organic" or "algorithmic") search results. wikipedia.org

A blog is a personal journal published on the World Wide Web consisting of discrete entries ("posts") typically displayed in reverse chronological order so the most recent post appears first. wikipedia.org

Social bookmarking is a method for Internet users to organize, store, manage and search for bookmarks of resources online. Many online bookmark management services have launched since 1996; Delicious, founded in 2003, popularized the terms "social bookmarking" and "tagging". wikipedia.org

An article is a written work published in a print or electronic medium. It may be for the purpose of propagating the news, research results, academic analysis or debate. wikipedia.org

Social media marketing refers to the process of gaining traffic or attention through social media sites. wikipedia.org

Most good quality blogs are interactive, allowing visitors to leave comments and even message each other via GUI widgets on the blogs and it is this interactivity that distinguishes them from other static websites. In that sense, blogging can be seen as a form of social networking. wikipedia.org

YouTube is a video-sharing website on which users can upload, view and share videos. wikipedia.org

An Internet forum, or message board, is an online discussion site where people can hold conversations in the form of posted messages. They differ from chat rooms in that messages are at least temporarily archived. wikipedia.org

Backlinks, also known as incoming links, inbound links, inlinks, and inward links, are incoming links to a website or web page. wikipedia.org