I think texting is impeding our social ability to mix, mingle and communicate with one another. I know people who are adept at texting messages, ie, in Short Messaging Service (SMS) language that they are unable to send a grammatically correct business email. This reflects badly on the organisation.
On the other hand, I have seen people texting while riding their bikes and i feel that this act puts themselves and others in danger. If they want to text, they should at least stop and call the person on the other end instead of texting.
As for texting in classroom, that is wrong. They are there to study and not text. After all, is it that hard to communicate with the person sitting next to you.