Social Network Software and Social Networking Engines
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Enterprise Social Network software allows an organization to build an effective
community where group members can assist one another in performing the
assigned tasks.  <br>
A well designed Business Social Networking system should
integrate modern collaboration tools such as forums, instant messaging, blogging,
micro-blogging, file management, bookmarking and tagging.
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Another important feature in choosing an Enterprise Social Networking Software is access
control so that intellectual property and sensitive information cannot be
accessed by non-members.  
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The system administrator should manage the authentification of the users and
also assign roles to the users such as group administrators and moderators, etc. 
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The group administrators and moderators should monitor and approve the
contents published in the Social Networking system to ensure that the users
are using the system effectively and that the company usage policy are enforced.
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There are many public social networks such as facebook, myspace, linkedin,
wordpress, technorati, youtube, bebo, and feedburner.  micro-blogging sites such as twitter.
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Enterprise social business software such as IBM Connection and Microsoft
Sharepoint are already implemented in large fortune 500 corporations.
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IBM is releasing BlueTwit while Oracle has the OraTweet.
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facebook and google has released API so that 3rd party software developers can
integrate into their network.
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http://en.wikipedia.org/wiki/Comparison_of_social_networking_software
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sso (single-sign-on)
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RSS (reader/Aggregator)
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Access Control
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Wiki
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Forum
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Blog
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File Management/Media Sharing
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Instant Messaging
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Event Calendar
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Tagging


Blog
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is a chronological log of thoughts published on a web page.  Blog refers to "web logs" in which users will periodically post important topics and then allowing readers to add comments.  Examples include Slashdot, LiveJournal, BlogSpot
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Blog
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is a personal document and if you click on the checkbox "public blog" then
everyone can see.  If you uncheck the box, then it becomes private
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"trackbacks" are similar to footnotes, permalinks, blogrolls. 
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Microblogging
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Microbloggers uses one sentence to post what is happening from moment to moment to tell people what they are doing at the moment.
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Forum <br>
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forum tools (aka. bulletin board systems)
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The most popular forums such as phpbb, vbulletin, etc are written using PHP.
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Most forums can be divided into flat or threaded forums.
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Types of Forums (Flat and Threaded)
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A flat forum will display all the posts in a chronological order.  This type
of forum are ideally suited for postings that does not require a lot of
replies.
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A threaded forum will order the discussions in a tree structure based on the replies of various users.
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tags<br>
A tag is a non-hierchical brief description(label) to a content such as a forum, blog, file, a chat session, etc that best describes the article. <br>
All tags are "public" which means that all tags created by the auther or user
can be searched by all users of the system. <br>
Tags must be all-lowercase, no spaces are allowed, numbers are allowed but should not be the first character of the tag, and no punctuation.<br>
For the oppossite meaning of a tag, please add a "!" preffix, for example, "!allowed" means "not allowed"

Tags are usually singular.
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