Abbrieviations

LOL - Laugh(ing) Out Loud,
BRB - Be Right Back,
AFK - Away From Keyboard,
LMAO - Laughing My Ass Off, (may appear in small letters, like lmao)
ROTFL - Rolling On The Floor Laughing,
L8R - Later (as in See You Later) can also appear as l8er,
A/S/L - Age/Sex/Location (or a combination of those),
W/B - Welcome Back,
RTFM - Read The F**king Manual!
TTFN - Ta Ta For Now,
J/K - Just Kidding,
# - Signifies singing, (e.g. #Some Songs Are Very Very Long...)
M - Male,
F - Female,
'Cyber' - Very nearly always means Cyber-Sex. This is not allowed in HHome Chat.

Faces

Sometimes, people may uses faces to show how they feel. To view the faces, you will need to tilt your head to the left. Here are a few examples:-

:-) - Happy,
:-( - Sad,
:-| - Normal,
;-) - Winking,
:-D - Very Happy,
:-P - Sticking Their Tongue Out,
:-P~~~ - Drooling,
8-) - Someone With Glasses,
:-X - Kissing,
:-X followed by :-P - French Kiss,

Faces can be varied, so be creative. You should remember that some people may not understand complicated faces, so try and keep them reasonably simple.

Other Items

These are other little tricks which can be used in a chat room.

~~~><>~~~ - A Fish,
\~/ - Glass of Water,
@_v - A Snail,

Some people may use various shorthand styles too. These can include U (you), Y (why?), b4 (before), c (see), and so on... Also, abbreviations of states or countries can confuse people. The place Georgia is also annoying, so mention if it is the state or the country. You should also consider that other people may be from other areas of the world, so consider the type of grammar used, and try and avoid uncommon slang words.

A Few Phrases which I commonly used.

Mentioning your website address can encourage a few people to have a look at your site. They might like it and you might get some fans. Although typing in your website address every 5 seconds is not recommended. Every 10 minutes or so would seem ideal.

Avoid using CAPITAL LETTERS when possible, as that indicates shouting, and is not allowed in some chat rooms.

Before you go, that's the best time to say a really catchy sentence. Here are a few which I used often.

And I Ran, I Ran So Far Away...
blblblblblblblblblblb....... >GONE< (Supposed to be a Star Trek style teleport)
I Shall Return, But Firstly I Must Leave!