The Viral Marketing Effect - eMarketer- read entire article
From the article:
B2B and B2C marketers diverge on what they consider successful viral tactics. B2C companies were more likely to consider blog mentions and posting to sites such as MySpace or YouTube to be something that would generate attention for their viral campaigns. B2B marketers were more interested in getting their viral campaigns mentioned in an online publication or business print publication, according to MarketingSherpa.