Igoritza said:oh man . that's for another topic, i can make 1000 examples where in english there are unnecessary letters in words everywhere. if you spell - "U" same as "you", why do you write 2 additional letters ?
Well, since English is not your first language, I'll explain. On the internet, your writing skills determine how seriously people take you. Stereotypically, it's idiot 15 year olds or lazy/uneducated people who use "u" or other made up contractions.
So, if you want people to give any credibility to what you say, take that extra 10 seconds to doublecheck your spelling and grammar. Just hammering out badly-spelled replies as much as possible doesn't make anyone listen, it just makes them tune you out.