As you can see from the screen graphic, they are currently seeing about between 1,500 and 2,500 tweets per hour.
Full info here
Update - as a keen-eyed reader has pointed out, this is very similar to the game for VW Fox in Brazil, back in 2011
Good Examples of Digital Creativity and Media Usage including online advertising, web sites and search marketing. Compiled by Dan Calladine, Aegis Media - firstname.lastname@example.org All views expressed are my own. This blog currently receives about 150 unique visitors per day, according to Google Analytics. Follow me on twitter - I'm @dancall