Is the sentence "me too" correct ?

Is the sentence "me too" correct in English ?
Would you use that expression ?

What else could we say ?

Erm. Maybe "Me again." "I do, too."

"Me too." is just fine.

But there are some alternatives, right?

some alternatives:

"I concur."
"That goes for me as well." (though you wouldn't say "me as well")
"Same here."
"Same for me."
"Likewise."

"In concur"....cool. I didn't know that one.

"I (!) concure", sorry. Can't spell anymore....

"I concur" would actually be the same as "I agree". It depends on the context of course. If you were going to say "Me too" in response to someone saying "I'm going to go to the bathroom" you wouldn't say "I agree."

Well, you could, but they'd look at you funny.

Nice to see all this answers.
Thank you.

@ SHW: LOL

[Ooops ! "all these answers"]

Are you obliged to use "Likewise" in a sentence ?

For example, if someone ask you "how are you ?"
and you answer "fine, what about you ?"
can you tell him "likewise" (I guess not) ?

Sounds odd....

You can use "likewise" as a sentence, but not quite like that. I think moreso, it's used in response to an imperitive. Let me give some examples.

"I'm ready to leave."
"Likewise."

"I think it's supposed to rain tomorrow, does anyone know?"
"I heard it was supposed to."
"Likewise."

"I'll have the steak."
"Likewise."

Said in response to a statement, not a question.

This is how this forum should be used, learning English!

--just another English learner who miss how to learn English through this forum--

In written language, the correct form is:

"Me, too." (notice the comma)