AFAIK	as far as I know
AKA	also known as
ASAP	as soon as possible
B4N	bye for now
BAK	back at keyboard
BBL	be back later
BCNU	be seeing you
BFO	blinding flash of the obvious
BRB	be right back
BTW	by the way
CTRN	can't talk right now
DHTB	don't have the bandwidth
F2F	face to face
FWIW	for what it's worth
FYA	for your amusement
FYI	for your information
G2G	got to go
GFY	good for you
GGBB	gotta go bye bye 
GL	good luck
GMTA	great minds think alike
GTGB	got to go bye
HTH	hope this/that helps
IAM	in a meeting
IDK	I don't know
IHMB	I hate my boss
ILU	I love you
IM	instant message
IMHO	in my humble opinion
IMO	in my opinion
INALB	I'm not a lawyer but
IOH	I'm outta here
IOW	in other words
IRL	in real life
ITS	I told you so
KIT	keep in touch
LOL	laughing out loud
LTL	lets talk later
LTNC	long time no chat
LTNS	long time no see
LU	looking up
MAYB	maybe
NM	nothing much
NP	no problem
NRN	no reply necessary
NYO	need your opinion
PDQ	pretty darn quick
PLS	please
PMFJI	pardon me for jumping in
POS	(parents over shoulder -- change subject)
POV	point of view
ROTFL	rolling on the floor laughing
RSN	real soon now
RTFM	read the "fascinating" manual
SLAP	sounds like a plan
TIA	thanks in advance
TMI	too much info
TTFN	ta ta for now
TTYL	talk to you later
TTYS	talk to you soon
TU	thank you
TX	thanks
TY	thank you
TYVM	thank you very much
U	you
U2	you too
UKW	you know who
UW	you wish
WB	welcome back
WFM	works for me
YMMV	your mileage may vary