If you are new to the Internet, it is important to remember that some of your customers may not be.  So, even though you may choose not to use any of the abbreviations or acronyms, you will still be exposed to them.

It is extremely common for standard capitalization and (unfortunately) spelling to be ignored in all forms of Internet communication.  This is considered acceptable in chat, and informal e-mail correspondence, but it is to be avoided on business e-mail and web pages.