John Gruber, in a link to something about using periods to end a sentence,1 remarks:
I used to write more formally in texts and IMs, but as time goes on I’ve developed/accepted more of a dashed-off style, super terse, and without thinking about it, I do often omit the trailing period. Hitting “Send” feels like punctuation enough.
This is a pet-peeve of mine. I hate it when people don’t capitalize, and punctuate text messages because they are “just a text message”. I fully understand the logic, but I hate it.
I don’t care if you agree with me, but I do want to tell you something. I am an employer, and right or wrong I judge every correspondence you have with me. If you are misspelling shit and/or refusing to punctuate things in text messages, I strongly urge you not to fucking text message me.
Put another way: why would I want to promote you, or put you in higher paid positions, if every time you text me you can’t even be bothered to double-tap your space bar on the iPhone to put in a period.
Didn’t read it, don’t care to read it. ↩