What's happening to the english language?

Okay, so after all this time, I was finally suckered into this Facebook. ....... now stick with me on this because I may start to ramble through annoyance.
I get that people are not always good at spelling, I am one of them, I get that sometimes not everyone's grammar is perfect, again I am one of them.
To a degree I can understand why this text slang milarky came about. BUT what I dont get is my 17 almost 18 year old brother sent me this message on facebook:

Hey sis U no I carnt speek Norwegan, U av 2 tork english.

Now, Kids can be kids, but this completley took me off guard, I was utterly shocked,,, so I check out my kids page and it became quite clear what was happening.... all his "friends and family" aged 15-40 all spoke the fucking same!!

This next passage is one of the replies to my Sean off a girlfriend of his:

sean im nt gunna find n e one that quick! haa its only bin a day.. im nt like you.. oj :D x n nooo we fell out i sed sorry but hes bein a mard arse x n wtf did u walk in and out ov the LRC this mornin
Awwww Im Thee One x Yhoo Two I Dintt Wanna Say Incase It Was Cheeseyy But Now Ive Seen It Im Like Awwwww I Loveee Youuuu.

Now this is so fkin frustrating because I sent him a private email asking him, to please send me a message and prove to me he can spell becasue I was highly dissapointed, I needed to know he was not just being fashionable so to speak. He emailed me back and it was perfectly good english. So my question is why is the "youth" of today not satisfied with the text slang, why have they taken it upon themselves to completley change the spelling of a word and not just abriviate it which to a point was acceptable,,,, it, night has become nytte..... its fkin annoying,,,, these people have had the same schooling as me, and I like to think I use the english language well and to it's full capacity.
Aaaaaaaghhh! I have norwegian friends who speak and write better english than the english..... and although thats great for me because I live in Norge, it still sucks donkey dick for the rest of the english. Thankyou
Toodlepip