What are all these Abbreviations I keep seeing?

AFAIK = As Far As I Know
AFK = Away From Keyboard
ATM = At The Moment
BBIAF = Be Back In A Few
BBL = Be Back Later
BRB = Be Right Back
BTW = By The Way
C U L8R = S(C)ee Y(U)ou L8(ate)R
C Ya = S(C)ee Y(Ya)ou
EG = Evil Grin
FWIW = For What Its Worth
GMTA = Great Minds Think Alike
IIRC = If I Recall Correctly
IMHO = In My Humble Opinion
IMO = In My Opinion
IRL = In Real Life
JK (J/K) = Just Kidding
LOL = Laughing Out Loud
LTNS = Long Time No See
NP = No Problem
OIC = OH I S(C)ee
RL = Real Life
ROFL/ROTFL = Rolling On (The) Floor Laughing
RTFM = Read The Flippin' Manual
STFU = Shut The Fuck Up
TTFN = Ta-Ta For Now
WB = Welcome Back
l33t = Elite
re = Repeat Hi