That's 1 in every 10 people with electricity.

If we assume that people who live on less than $10 a day don't have a computer, or access to one, or cannot actively use Facebook on whatever computer they do have access to...

  That's 5 in every 13 people who have access to Facebook.

Population and other stats from: http://www.globalissues.org/article/26/poverty-facts-and-sta...