Click on the little Mario head (aka the Show Profile button), $$Wario$$. It will show you the number of posts you have done.
Mine is 221, though if you add the 70 from when I was 'RoyKoopa' without the space, you get about 291.
I actually thought it would be higher, concidering how often I come here...eh, whatever. :)
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I''ve decided to add a signature. Now...what should I type? Hmm...