Imagine if it was found-out that Google was blocking a competitors advertisements. Believe it or not, Facebook is also in the business of advertising company. Yes, they make money off of Facebook points, but how do you think they really keep afloat? They use Facebook.com as a directed advertising research tool. Google offers you search, email, android, docs, etc.. all as platforms for their advertising business, that's how they make money. Facebook does the same thing, from a different angle. They offer you social networking, casual gaming, etc.., all for advertising research. You don't think they run Facebook.com out of the goodness of their hearts do you? Hell, Zuckerberg conceived of the whole idea solely to get information on other people to sell it. Remember when he got in trouble when an old converstation of his was brought up and he talked about how stupid people [at harvard] were for using facebook and just giving him their information of their own free will? There is a difference between marketing (commericals, ads, etc..) and marketing research (surveys, Nielsen boxes, etc...). Google runs an ad network. Facebook runs a marketing research firm. Facebook gathers all the information (trends, likes, dislikes), and sells that to advertisers, who can then refine their product and refocus their advertising. So yeah, Facebook blocking a competitors ads reeks of anti-competitive behavior, but then again, so did hiring an advertising firm to lie about Google in their advertising, and people only seemed to care about that for a couple days as it was.