Facebook is still trying to convince advertisers and agencies to re-invent advertising for social media, rather than giving them what they’re familiar with. The social network’s latest offerings did address some advertiser demands in terms of how ads are sold and placed, and Facebook finally offered some jazzier formats. Facebook could grow its ad revenues faster if it caved in a little more, and served up some more bones to conventional thinkers on Madison Avenue. Things like interstitials or takeovers. Or, it could actually start building the ad network that everyone thinks it will eventually get around to. Rumor has it that Yahoo has some assets for sale.