4

I tend to think it is, as "too" serves the role of a referential phrase, repeating the verb-phrase of a preceding sentence, and "you" acts simply as a subject pronoun. But, I've heard an argument to the contrary.

4

The Chicago Manual of Style, Commas (fifth question on the page), says no, but it's a pretty soft no. If you felt stylistically compelled, it's not clearly wrong.

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