This “scientific” study says that ending text messages with a period makes you look like a jerk.
I’m kind of a noob when it comes to texting. I type 90+ words per minute, but I text at about 1 word per minute because it takes forever for me to peck at the keys on the screen. Because I spend so much effort typing out a single text message, I like to make sure it’s grammatically correct. I also like to be that annoying person who makes a point of using proper grammar and punctuation in texts just because no one else bothers to. So I guess I am a jerk. 🙂
However, I do agree that ending a very short message with a period seems cold. Like if you say “Thanks.”, it might come off as terse or sarcastic. That’s why I normally use an exclamation point with “Thanks” or similar kinds of words. Most people would probably use “thx” and not even bother with the period, which seems less rude for some reason.
If you really don’t want to be misconstrued via text, just call the person. Or better yet, talk to them face to face if you can. Then you don’t necessarily have to worry about all that pesky punctuation.