i agree with sophie - it is harder and just takes longer to read and looks lazy, ignorant and is irritating - many will simply not read it and you don't get the same amount of replies.
we have all learnt to spell and read the same language - we hav ebeen taught it and thats what we expect to see when we look at writing - we are never taught phonetic writing and so everyone does it their own way - thereby making it hard to read.
jafinked issiz zeezyertur eedtha nyorit ing? itsfo netti krytins owitsh udbeyeez eart ooreed notthowis it?
the 'yer' is odd because everything else is generally written correctly and this just sticks out.
when reading text speak you almost have to press a button in your mind onto decipher mode, but mid sentence it is odd.
i have never had a moan at 4get about it though, can't say it bothers me.