Common features of this include:
1: Doubling up on vowels. Example: "ii lovee youu<3".
2: Deliberate misspellings: "hii babess yhuur so sexcee!"
3: Lack of proper punctuation. This can be seen above. The only punctuation used is an exclamation mark, and that is only used in situations which don't seem to require it.
4: Using MSN keyboard shortcuts in places where they won't display an emoticon: "omg ii luuuuve basshunter (8) now yhuur gone ii keep waiitin heeree by the phonee (8)"
"omg hiiiii ii lhuuuuve urban dictionariii its the bestoozz!! and speakiin of bestoozz shouts ouut to maii bestoo bexxah i luuuurve yhuu girl!!!! (8) shoppiiin on mondaii cant w8!!!! "