Amen.
I don't use those particular terms either. About 9 years ago when I first discovered the message board world, I had to finally ask someone to please provide me with a dictionary of acronyms commonly used in posts. I had no clue what all the DDs, DTDs, TTCs, LMAOs, YMMVs, IMHOs, etc etc were all about. I also asked my SIL why she kept burping at me when we were chatting online (brb).
I still come across ones I've never seen before.
My daughter puts SMH on things all the time on her facebook posts, and I don't know what that means. 
I'm old and moldy. Not my fault.