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
"Stop living in a vacuum ... the average person on Earth does, in fact, use Facebook."
No qualifications made for internet access
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).