What are blogs?
Blog is a web-based publication consisting primarily of periodic articles, most often in reverse chronological order. Early weblogs were simply manually updated components of common websites. However, the evolution of tools to facilitate the production and maintenance of web articles posted in said chronological fashion made the publishing process feasible to a much larger, less technical, population. Ultimately, this resulted in the distinct class of online publishing that produces blogs we recognize today. For instance, the use of some sort of browser-based software is now a typical aspect of “blogging.” Blogs can be hosted by dedicated blog hosting services, or they can be run using blog software on regular web hosting services.”
RSS – What is it?
Many words have described the acronym RSS. The following is a list of the various words and the standards ascribed to them. Like Atom, it is an XML format used for publishing and editing content for websites, blogs, and podcasts.
• Really Simple Syndication (RSS 2.0)
• Rich Site Summary (RSS 0.91, RSS 1.0)
• RDF Site Summary (RSS 0.9 and 1.0)
• Real-time Simple Syndication (RSS 2.0)
What Is Atom?
Web resources that are updated periodically use Atom, which is an XML format, used for publishing and editing content. Some feel it addresses problems found in RSS.
On Web pages the web feeds like Atom or RSS are typically linked with symbols.
• A wiki ( /ˈwɪki/ WIK-ee) is a website that allows the easy creation and editing of any number of interlinked web pages via a web browser using a simplified markup language or a WYSIWYG text editor. Wikis are typically powered by wiki software and are often used to create collaborative websites, to power community websites, for personal note taking, in corporate intranets, and in knowledge management systems.
• Wikis may exist to serve a specific purpose, and in such cases, users use their editorial rights to remove material that is considered "off topic." Such is the case of the collaborative encyclopedia Wikipedia. In contrast, open purpose wikis accept content without firm rules as to how the content should be organized.
• Ward Cunningham, the developer of the first wiki software, WikiWikiWeb, originally described it as "the simplest online database that could possibly work." Wiki" Hawaiian word for "fast". "Wiki" has been backronymed by some to "What I Know Is"
Social Bookmarking – Overview and Uses
Social bookmarking is a way to upload and organize the sites you normally would ‘bookmark’ so that they are accessible and shareable at any time from any computer.
Photo sharing is the publishing or transfer of a user's digital photos online, thus enabling the user to share them with others (whether publicly or privately). This function is provided through both websites and applications that facilitate the upload and display of images. The term can also be loosely applied to the use of online photo galleries that are set up and managed by individual users, including photoblogs.
The first photo sharing sites originated during the mid to late 1990s primarily from services providing online ordering of prints (photo finishing), but many more came into being during the early 2000s with the goal of providing permanent and centralized access to a user's photos, and in some cases video clips too. Webshots, SmugMug, Yahoo! Photos and Flickr were amongst the first. This has resulted in different approaches to revenue generation and functionality amongst providers.
While photoblogs tend only to display a chronological view of user-selected medium-sized photos, most photo sharing sites provide multiple views (such as thumbnails and slideshows), the ability to classify photos into albums, as well as add annotations (such as captions or tags) and comments. Some photo sharing sites, even small ones with only a few million photos, provide complete online organization tools equivalent to desktop photo management applications.
A folksonomy is a system of classification derived from the practice and method of collaboratively creating and managing tags to annotate and categorize content. this practice is also known as collaborative tagging, social classification, social indexing, and social tagging. Folksonomy is a portmanteau of folk and taxonomy.
Folksonomies became popular on the Web around 2004 as part of social software applications such as social bookmarking and photograph annotation. Tagging, which is characteristic of Web 2.0 services, allows users to collectively classify and find information. Some websites include tag clouds as a way to visualize tags in a folksonomy.
Attempts have been made to characterize folksonomy in social tagging system as emergent externalization of knowledge structures contributed by multiple users. Models of collaborative tagging have been developed to characterize how knowledge structures could arise and be useful to other users, even when there is a lack of top-down mediation (which is believed to be an important feature because they do not need laborious explicit representations as in semantic web). In particular, cognitive models  of collaborative tagging can highlight how differences in internal knowledge structures of multiple users can lead to different emergent properties in the folksonomy of a social tagging system.
An empirical analysis of the complex dynamics of tagging systems, published in 2007, has shown that consensus around stable distributions and shared vocabularies does emerge, even in the absence of a central controlled vocabulary.
• AG (BBS), a DOS-based bulletin board system software program
• Tag (metadata), a keyword or term associated with or assigned to a piece of information
• Tag system, a deterministic computational model
• Knowledge tag, a type of meta-information that captures knowledge about content, media, or data
• Electronic tagging, a form of non-surreptitious surveillance
• Revision tag, a textual label associated with a specific revision of a project
• HTML tag, part of an Hypertext Markup Language document
• Tag (programming), a method for passing parameters to subroutines
• Tag editor, software for editing the metadata of multimedia files.
What is a Podcast?
Podcasts are audio programs that are broadcasted over the Internet. They are MP3 files which can be downloaded onto a compatible digital player or played on your computer. You can download one or many, for free (generally), or you can subscribe to an RSS service for downloads so you can be alerted when new postings are made available. The name podcast comes from compounding the words iPod and broadcast.