The Internet has developed its own specialized language and "slang". Since most communication is achieved through typing messages, a number of shortcuts have evolved to speed up the process. Some of the most commonly used abbreviations are:

BTW - By The Way		.com - domain suffix for a commercial entity
CYA - See You Around		.edu - domain suffix denoting an educational institution
FAQ - Frequently Asked Questions		.gov - domain suffix used by the government
HTH - Hope This Helps		.mil - domain suffix for military organizations
IMHO - In My Humble Opinion		.net - domain suffix denoting a network entity
MOTD - Message Of The Day		.org - domain suffix denoting a non-profit group
PPL - People		TIA - Thanks In Advance
OTOH - On The Other Hand		TTTT - To Tell The Truth
RTM - Read The Manual, also RTFM		YMMV - Your Mileage May Vary
LOL - Laughing Out Loud		ROFL - Rolling on the Floor Laughing
TTFN - "Ta-Ta" For Now		TANSTAAFL - There Ain't No Such Thing As A Free Lunch
FWIW - For What It's Worth		AFAIK - As Far As I Know