Do you find yourself always agreeing with anyone? Do you sometimes go to answer a question and find that person said exactly what you were going to? Do you feel, based on this person’s answers, that you think/act very similar? I don’t mean someone who has the same opinions as you, but someone who is just like you.
I have not been here very long so I can’t identify a fluther twin yet, but I do sometimes notice I want to give the same smartass (in a funny way) answers as AstroChuck. I am in no means close to achieving AC’s flutherific-ness, but I can only hope to someday rise to his level.