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"One billion people have a Facebook account." " the average person on Earth does, in fact, use Facebook."

The population of the earth exceeds 7B (http://www.census.gov/population/popclockworld.html) so in fact the average person on Earth does not use facebook

*unless you live in a vacuum where 1/7 counts as half

You have to factor in the number of people who have regular internet access though.

I wouldn't be surprised if more than half of americans ages 18-24 have a facebook account but the original quote was:

"Stop living in a vacuum ... the average person on Earth does, in fact, use Facebook."

No qualifications made for internet access

Who cares about the qualification. Your entire premise is just ridiculous.

You can't just take your single data point (my close friends aren't on Facebook) and then extrapolate it (most people aren't on Facebook).