My 20-year-old daughter and I got into an all-out screaming match about using a period at the end of a sentence in text messages.  She says it makes me sound hostile.  I've been on the Internet since around 1992.  I understand and use emoticons, abbreviations, /s, etc... However, I usually use complete sentences, proper grammar, and accurate punctuation.  Doing otherwise looks incomplete to me.  FYI, I'm a Gen-Xer.  