There is little scientific data on the point, but evidently people do speak to themselves. - David Crystal

I believe that any form of writing exercise is good for you. I also believe that any form of tuition which helps develop your awareness of the different properties, styles, and effects of writing is good for you. It helps you become a better reader, more sensitive to nuance, and a better writer, more sensitive to audience. Texting language is no different from other innovative forms of written expression that have emerged in the past. It is a type of language whose communicative strengths and weaknesses need to be appreciated.

During the later part of the 19th century, it was believed that a sound of change affected the whole of a language simultaneously: one sound system would smoothly develop into the next, and all words which contained a particular sound would be affected in the same way.

The structural properties of the language are many and complex, but at least they are finite and fairly easy to identify: there are only so many sounds, letters, and grammatical constructions, and although there is a huge vocabulary, at least the units are determinate and manageable.