Textual activity is a necessity to many. Now consider the following:
SMS 1) "Uhm, did u get my email this morning re: that SMS I got last night from ___ after I let a VM for them when I was at that event in SF?'
SMS 2) "ja, ja, & ja."
SMS 1) "Oh my, s/o's chatty this AM!"
SMS 2) "k. N1"
Tip of the hat to the second texter. 'Economy of speech' par excellence.