I was taught that it is properly written as "Me, too." But a book (The sixty-eight rooms, by Marianne Malonne) I've recently read uses "Me too."
Which one is correct? Are tone and pronunciation affected?
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Perhaps it'd help to remember that comma is not merely to separate phrases, it is also used to denote a very short pause when you speak. When you read "Me, too" aloud, you're expected to pause for a bit directly after saying "Me". "Me too", on the other hand, does not require you to pause
Taking into account those, you'd much more likely to encounter "Me too" when it's meant to be said quickly. There's nothing wrong with that phrase.
Perhaps a bit of context of when this was said can help