On a related note to your related note, there's long been a difference between written language and spoken language [1]. Written language tends to be more complex, since it's easier to pause and think about what you're going to say, and it's still easy to understand because the reader can read it over and over again. Some writers find it difficult to write dialog for this reason, it's such a shift in format. Spoken language also tends to run on with incomplete sentences because people want to hold the channel open for themselves while they are forming a thought, but others also want to break in for their turn.

Now with the Internet and texting, of course you get plenty of regular, formal written English like I am doing right now. But you also get a new shorthand, and new information being presented. its like omg lol and you don't need punctuation

just send another text

this is how we pause for...

dramatic effect

It might be too early in the development of the Internet and smartphones to really key in on any sort of new grammar rules, but it's really worth thinking about. Plenty of times I find myself thinking "should I write haha or lol or just send a smiley", so there will be some rules shake out of it for sure.

[1] http://www.omniglot.com/writing/writingvspeech.htm