a quick look at quantcast shows that US traffic (which is by far the most monetizable) hasn't grown at all since july 09 (though there is a nice bump in intl. traffic)
http://www.quantcast.com/twitpic.com
so i would say 2-3 mio is a more reasonable assumption than 5 mio. which is still fantastic.
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in the interview he says around 1.5 mio in 2009
a quick look at quantcast shows that US traffic (which is by far the most monetizable) hasn't grown at all since july 09 (though there is a nice bump in intl. traffic) http://www.quantcast.com/twitpic.com
so i would say 2-3 mio is a more reasonable assumption than 5 mio. which is still fantastic.