A

AFAIC

as far as I'm concerned

AFAIK

as far as I know

AFAYC

as far as you're concerned

AFK

away from keyboard

AKA

also known as

AML

all my love

ANFSCD

and now for something completely different

ASAP

as soon as possible

ASL

age/sex/location

ASLMH

age/sex/location/music/hobbies

ATB

all the best

ATK

at the keyboard

ATM

at the moment

AWOL

absent without leave

B

B4N

bye for now

BAK

back at keyboard

BBFN

bye bye for now

BBL

be back later

BBS

be back soon

BBSL

be back sooner or later

BCNU

be seeing you

BFN

bye for now (alternative)

BKA

better known as

BRB

be right back

BRT

be right there

BTDT

been there, done that

BTW

by the way

C

CID

consider it done

COZ

because

CU

see you (goodbye)

CUL

see you later

CUL8ER

see you later (alternative)

CY

calm yourself

D

DMI

don't mention it

DUCT

did you see that?

DYLM

do you like me?

E

EG

evil grin

EL

evil laugh

F

F2F

face to face

F2T

free to talk?

FAWC

for anyone who cares

FC

fingers crossed

FOAF

friend of a friend

FTASB

faster than a speeding bullet

FTF

face to face

FWIW

for what it's worth

FYI

for your information

G

GA

go ahead

GAL

get a life

GALGAL

give a little, get a little

GBH

great big hug

GG

good game

GGN

gotta go now

GL

good luck

GMTA

great minds think alike

GTG

got...