Possibly because they have by far the most corporate shuttle traffic in the city: http://sfist.com/2012/09/25/behold_the_secret_corporate_shuttle.php http://sf

Possibly because they have by far the most corporate shuttle traffic in the city: http://sfist.com/2012/09/25/behold_the_secret_corporate_shuttle.php http://sfist.com/2012/09/25/behold_the_secret_corporate_shut... Sort of like calling a tissue a Kleenex, I suppose. The shuttles for other tech giants pale in volume compared to Google.