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This morning, there are more than one billion people using Facebook actively each month.
Facebook Reaches 1 Billion Active Users [newsroom.fb.com]
joined:Apr 20, 2012
..that would mean that 1 in 7 people own a computer or a phone
Add to that the fact that Google Adwords are just too dear for the ROI.for your ROI maybe..but for the vast majority who use them, the ROI of adwords is fine..