What especially drives me nuts is seeing an apostrophe in what should be the possessive "its"; "it's" is always a contraction of "it is." So a good way to check that is to read your sentence to see if "it is" is what you intended---that is, whether you meant the possessive "its" or the contraction for "it is."
Some good writers make this mistake, but to my eye it separates them from professional writers (although I am seeing more and more of it from paid online writers).
There's a good explanation of its/it's here:
http://www.writing.com/main/view_item/item_id/1215284
(I've mentioned this pet peeve before, at the risk of being a dull pendant, but this thread emboldened me to repeat it.)
My two opening sentences above call to mind the question of putting a comma or period inside or outside quotation marks. I think it's a difference between American and British styles. The British (obstinately, hehe) put the period after the quote mark, while the American style---pretty much always---is to put the period before the quote mark.
Now in regard to "LOL," somewhere I got the impression that LOL is an old ham radio shorthand expression that carried over to online usage. If you're tapping out Morse code, "LOL" is a lot faster and easier than "That was so funny I'm laughing out loud!" Any hams out there know about that?
And to Jack---can't resist nitpicking (ahem, 'LOL'): "Washington State" is the university, while distinguishing "Washington state" from Washington, D.C. uses lower case for "state."
The
Associated Press StyleBook and Libel Manual (I got the "state" usage from it when writing something years ago) is an excellent reference for that sort of thing. I urge anyone who takes their writing seriously to have a copy handy. I also agree that "Elements of Style" is an excellent reference, besides being a hoot to read.
Ok, a quick proof-read and spell check and I'm outta here. Thanks for the interesting thread!