The condition when a lack of speech emphasis in an online conversation leads to confusion and misunderstanding which usually results in an argument.
Possible examples where msn syndrome may come into affect
"That was really funny" Funny haha, or sarcastic retort?
"That top really suited you" Genuine fashion kudos or friendly banter?
The condition that you cant help pressing the 'enter' button once you finish typing, even it is not a complete sentence.
"today i went to the mall yea"
"starbucks has this new drink"
"with jelly in it"
"i like it so much"
"dude, you totally have msn syndrome, finish your sentence in one box!"