The smack-talk inspiring contest of beer pong — known as beiruit in some quarters — scheduled between Facebook and IAC subsidiary CollegeHumor is off. Why? Because Facebook's PR and legal departments said so, CollegeHumor cofounder Ricky Van Veen told our tipster:

Facebook's PR and Legal dept said they can't participate. I guess that's what its like working in corporate America as opposed to a fun Internet company.

It's official: IAC's Barry Diller is the Web world's Fun Dad, while Facebook COO Sheryl Sandberg, brought in from Google to make Mark Zuckerberg's teen paradise more corporate, is Downer Mom. Cheer up, though, little Facebookers: Mother Sandberg did let you stay out late at the prom. Update: CollegeHumor is sad because they won't get to play with the smack-talk inscribed balls they designed specifically for this contest — pictured below.

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