Yahoo CEO Marissa Mayer scores a big deal to stream clips from "Saturday Night Live."  Yahoo now has exclusive rights to show video of the SNL hit comedy show from 1975 to 2012.  The content includes skits, digital shorts, and even musical performances.  The Sunnyvale-based CEO had earlier blogged about the deal, which requires anything SNL-related to be removed from Hulu as well as NBC.com.