I don't believe that anything should be in caps, even lol, etc. unless you are angry and want to show it. And yes, I read the etc in the earlier post as etcetera, not internet slang etc without the caps lock. I personally hate when people use caps as it does make me feel as if I'm being shouted at.
Acronyms should be in caps if they are for several words that are in caps. For instance, "FBI" is for "Federal Bureau of Investigation", whereas "lol" is for "laugh out loud".
I use the buttons after I write a post as a way to force myself to proofread. Still, things get by me. Sigh.