Commonly thought of as a series of letters that make up a 'word' there is a distinction between acronyms and shorthand.
The actual definition of an acronym and text shorthand is here.
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BTW: If you ever see someone TYPING AN ENTIRE SENTENCE IN ALL CAPITAL LETTERS that means SHOUTING!
It is not proper netiquette to TYPE IN ALL CAPS (even in email), in fact, it's annoying.
The majority of the expressions you see above are not acronyms, but rather shorthand used while text messaging or IMing.
There are several terms to describe different kinds of jargon including anacronym, backronym, weather acronyms, city acronyms, leetspeak and textonyms.
Online enthusiasts are learning that shorthand are in fact called acronyms, but this is incorrect.