Have a look at Dave Gorman's "Modern life is goodish", the episode from last week, to see his theory about the textspeak geberation.

Basically, he believes that he is in the generation that uses correct spelling and punctuation because that generation were not brought up with mobile phones as children.
The next generation is using textspeak as they were brought up with them.
The previous generation are learning how to use smartphones from their grandchildren and so are also using textspeak.

Robin