The power of tags and bookmarks will reflect the popularity of what you write about, what is important to other people

What is a Tag? A tag or keyword is simply a word you can use to describe a bookmark. Unlike folders, you make up tags when you need them and you can use as many as you like. The result is a better way to organize your bookmarks and a great way to discover interesting things on the Web.

What is a tag cloud?

A list of tags where size reflects the popularity of what you write about, what is important to other people. You’ll see a Tag cloud on blogs, it will instantly help you to recognize what they write about.

Wiki says, “In online computer systems terminology, a tag is a non-hierarchical keyword or term assigned to a piece of information (such as an Internet bookmark, digital image, or computer file). This kind of metadata helps describe an item and allows it to be found again by browsing or searching. Tags are generally chosen informally and personally by the item’s creator or by its viewer, depending on the system.”

Tags can be overused, Tagging systems open to the public are also open to tag spam, in which people apply an excessive number of tags or unrelated tags to an item (such as a YouTube video) in order to attract viewers. This abuse can be mitigated using the human or statistical identification of spam items. Beware, on this one. When blogging, be sure that your Post Tags are NOT the same as your Keywords, this can look like you are spamming.

What is social bookmarking?
Delicious is a social bookmarking website, which means it is designed to allow you to store and share bookmarks on the web, instead of inside your browser. This has several advantages.

First, you can get to your bookmarks from anywhere, no matter whether you’re at home, at work, in a library, or on a friend’s computer. Second, you can share your bookmarks publicly, so your friends, coworkers, and other people can view them for reference, amusement, collaboration, or anything else. (Note that you can also mark bookmarks on Delicious as private – only viewable by you – if you like.)

Third, you can find other people on Delicious who have interesting bookmarks and add their links to your own collection. Everyone on Delicious chooses to save their bookmarks for a reason. You have access to the links that everyone wants to remember. You can see whether two people have chosen to remember a link, or whether it was useful enough for a thousand people to remember – which may help you find things that are useful for you, too.

How do I save a bookmark? There are several ways to add a bookmark in Delicious.

• The recommended way is to use one of our browser add-ons. Once installed, clicking the ‘Tag’ button in your toolbar will bring up a
window to save a bookmark
• You can also use a bookmarklet on our bookmarklet page. These are simple buttons that go on your bookmarks toolbar
• On the Delicious site, clicking ‘SAVE’ next to links saved by other people or you can manually create a bookmark by clicking “Save a bookmark” on the top right of most pages.

When you save your first bookmark, you’ll notice some fields. Here’s a description of all of them:

• URL: field is simply the address of the page you’re bookmarking. Only change this if you know what you’re doing.
• Title: If you’re using one of our bookmarking tools, this will be prefilled with the title of the page you’re saving. Feel free to edit this in any way that makes sense to you.
• Tags/Keywords:  Enter one or more tags separated by spaces here. For more on tags, read our tags section.  Here’s where you may want to write some additional info for yourself or to let others know why you bookmarked this page.

Other Book Markers that you can use to share your content are:

A1-Webmarks – a free service that combines the convenience of a personal web mark server with the power of social web marking.

Google bookmarks allow you to rapidly bookmark an article, photo or research. You just drag their bookmark onto your browser bar. Your sites are organized intuitively using a new system called ‘tagging’. You can then access your list of sites from any machine or share your lists with anyone on the Internet.

Stumpleupon Ready to get started with a couple of new sites every day? Here’s a shortcut. Just add a convenient bookmark to your browser by dragging this Stumble button to your toolbar. Start stumbling from anywhere on the web, whenever you please.

FireFox explains how to save a Bookmark