Are they the irritating things that sprout up on your neck as you age?
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Oooooooooooh....such an important question........It's come up 3 times! 
And thanks for the lovely candle Syd 
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.
Tagging was popularized by websites associated with Web 2.0 and is an important feature of many Web 2.0 services. It is now also part of some desktop software.
http://en.wikipedia.org/wiki/Tag_(metadata)
Hope this helps 
Originally Posted by Heatseek:
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.
Tagging was popularized by websites associated with Web 2.0 and is an important feature of many Web 2.0 services. It is now also part of some desktop software.
http://en.wikipedia.org/wiki/Tag_(metadata)
Hope this helps
**Fiddles with wiggly tag on neck and contemplates** 
xx
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The hot guy in friends who dated Rachel 