Eh, I'm a former English teacher and think the prescriptive English is mostly good only for pedants and picky people (sorry!). If you can understand what someone is saying, does it matter?
My 50 year old sister who is one of the smartest people I know, and has a master's in business from one of the best schools in the country, is 100% dedicated to texting like a teenager. RU going 2 dinner? U shld C us l8r. I think it's hilarious.