eMarketer: Young Americans Still Fueling Facebook

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As Facebook reached 350 million users worldwide, its largest single source of growth was still the US.

Inside Facebook reported that the US gain of more than 4.5 million monthly active Facebook users was the highest number of any country. Because of the large installed base of US Facebook users, it represented a 5% gain, compared with 10% growth in countries such as Indonesia, the Philippines and Malaysia.