The video-sharing site YouTube is currently running a comedy sketch contest sponsored by Toyota’s 2009 Corolla. It’s just one of the latest examples of companies using this advertising hot spot to target customers who spend a lot of their time watching online videos. But finding a home in the medium is not so easy Wharton professors say. In a digital world of instant feedback and ruthless honesty a company can either score major brand points or look as ridiculous as any adult trying to hang with the cool kids.