While surfing the web and participating in online discussions (USENET, mailing lists, forums etc.) you're likely to come across a wide variety of acronyms, some more polite than others (just remember to grow a thick skin), not all of which have immediately obvious meanings.
The table below enumerates the ones that I know of - or at least those that I can think of right now... Obviously, if you can think of some that are frequently used and that have been omitted here then please do let me know.
AFAICS As Far As I Can See AFAIK As Far As I Know AFK Away From Keyboard AIUI As I Understand It BTDTGTTS Been There, Done That, Got The T-Shirt BTW By The Way ESAD Eat Sh*t And Die FOAD F**k Off And Die FUBAR F**ked Up Beyond All Recognition FUD (to spread) Fear, Uncertainty and Doubt FWIW For What It's Worth FYI For Your Information GIYF Google Is Your Friend HAND Have A Nice Day HTH Hope This Helps IANAL I Am Not A Lawyer IIRC If I Recall Correctly IIUC If I Understand Correctly IME In My Experience IMHO In My Humble Opinion IMNSHO In My Not So Humble Opinion IMO In My Opinion IOW In Other Words IRL In Real Life JFTR Just For The Record LMAO Laughing My Arse Off LOL Laughing Out Loud OOTB Out Of The Box OTOH On The Other Hand PDNFTT Please Do Not Feed The Troll PEBCAK See PEBKAC PEBKAC Problem Exists Between Keyboard And Chair POV Point Of View ROTF Rolling On The Floor ROTFLMAO = ROTF LMAO RSN Real Soon Now RTFM Read The F**king Manual SNAFU Situation Normal, All F**ked Up STFW Search The F**king Web TIA Thanks In Advance TPTB The Powers That Be TTBOMK To The Best Of My Knowledge TTYTT To Tell You The Truth WTF What/Why/Who/Where/When The F**k??? YADATROT Yet Another Desperate Attempt To Remain On-Topic (*) YMMV Your Mileage May Vary
(*) − RIP Norman De Forest, we'll miss you!
Last update: 10-NOV-2006