Strictly speaking, in my book, a comma should be used when too concludes a sentence, regardless of length. I too like unsalted popcorn. I do, too.
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HUBLOTHi AG,I like unsalted popcorn too. I like unsalted popcorn, too.Is the second one preferable?I agree with Gus, but you will see it done with no comma pretty often, and by people who don't make mistakes. Some use it, some don't. I do. There is a trend toward fewer commas, I'd say.