>Whats wrong with starting sentences with 'lol'
Nothing's wrong with it, per se, but the constant use of it makes it rather pointless, and to be quite frank, makes you look more like a kiddie than a professional.
>The purpose of language is communication.
Exactly. So use language, not a flood of useless smilies and silly abbreviations.
>and as long as people can read and understand what you are typing
Hmm, except that what you may be able to understand in terms of 'chatroom speak' may differ from someone who's never been to a chatroom or gone to MySpace. Using numbers in place of words makes it harder to decipher a post, in particular, for adults or professionals, which is the kind of crowd DaniWeb should be aiming to attract.