Facebook heads into its initial public offering on target to become a $100 billion company. But while its supporters see it as the next Apple (AAPL) or Google (GOOG), not everyone "likes" the company: Some detractors wonder whether the social networking giant could instead ultimately be headed to the junkyard to join MySpace and Friendster. General Motors (GM), for one, appears to no longer believe in the power of Facebook -- the automaker plans to stop advertising on the site because it said its paid ads had "little impact on consumers' car purchases," according to The Wall Street Journal. GM, the country's third-largest advertiser, had been spending about $10 million on Facebook ads, according to the Journal. The company will continue to reach out to customers through its Facebook pages, however. A spokesperson for GM said, "We look at this with all media outlets. We look at the effectiveness." The representative added that the auto maker mo...