Last year I removed the common web acronyms (LOL etc) as they are readily available and as an effort to keep the length of the lexicon somewhat manageable (see the link to the 2006 Lexicon and read the statement under the lexicon title for the changes I made to the pre-2006 lexicons).
Some acronyms used are long, though, and the longer they are, the more difficult it is to guess the definition. Will go look around to see if can find one, but probably won't very soon (at least within a few minutes).