Acronyms can be easily expanded with help of Type Pilot. Just type an acronym and Type Pilot will substitute it with a full phrase. Here are some examples:

AFAIC As far as I’m concerned
AFAIK As far as I know
ASAP As soon as possible
BRB Be right back
BTDT Been there, done that
BTW By the way
FAQ Frequently asked question
FYI For your information
HTH Hope this helps
IANAL I am not a lawyer
IMHO In my humble opinion
IMNSHO    In my not so humble opinion
IMO In my opinion
IOW In other words
LOL Laughing out loud
MOTAS Member of the appropriate sex
MOTOS Member of the opposite sex
MOTSS Member of the same sex
OTOH On the other hand
ROTFL Rolling on the floor laughing
RTFM Read The Fine Manual
WTF What the heck
YMMH You might mean here
YMMV Your mileage may vary

Insert phrases quickly in any text editor! For example:

1) You type: if1

2) You get: If you have any other questions, please don’t hesitate to contact us.

This letter can be typed just by pressing several keys:

Acronyms can be easily typed with help of Type Pilot

All this you can make with Type Pilot.

Common Phrases list: download and use!