Leave texting to friends and family and to coworkers who interact casually. Professors — however friendly they may seem in person — must relate to students in a professional way.
Tee Barron, an associate professor of mathematics, says she sometimes gets texts from students asking questions that they could easily have answered by consulting a classmate or the syllabus, but that can be corrected with a benign rebuke. “I’ll sometimes text back, ‘Hahaha by the time it took me to e-mail or text me you could have found this out yourself and now you’re going to have to anyway,' ” Barron says. “I think after the first couple times the [students] who are high-maintenance and try that — they start getting it.”So you're going to taunt and tease them into behaving appropriately? But you're not modeling appropriateness! You're letting them think you have a cutesy, jokey relationship. And who would text the 27 words "Hahaha by the time it took me to e-mail or text me you could have found this out yourself and now you’re going to have to anyway." (I'm counting "hahaha," a misspelling of "ha ha ha," as 1 word.) In the real world of texting, it's going to be more like "get it yrsf" or "u gotta b kiddng" or something even more abbreviated and subject to misreading.
It might work for Tee Barron, a math prof. Maybe math students are coolly unemotional, consuming messages, but I think student-teacher texting is likely to go bad... very bad. And that's assuming fully virtuous professors who don't even dream of entering into inappropriate relations with students.