jamyskis: Zynga's effectively the poster boy for crap Facebook games that encourage you to spam your friends or spend disproportionate amounts of money on useless shit. They are, however, far from being the only one, but they are the largest part of a phenomenon that is gradually killing off Facebook.
What bothers me is that there really isn't any reason I can see that Facebook / "Social" games need to be this terrible. Even the most casual of players deserve better than what many of these games offer. It's definitely not just Zynga, but as jamyskis said, they do come across as the poster boy for this gaming model.