Facebook Demographics 2009 Age Distribution from Google Ad Planner data – notice the red rectangle.

Notice the red rectangle

Facebook Demographics 2009 from Checkfacebook.com, showing purportedly 60% of Facebook global population from 8 different countries – notice how 18-24 age group is mostly higher than the other age groups.

By Checkfacebook.com

Facebook 2009 US Demographics shown by Facebook Ad demographic targeting tool roughly confirms the data given by Checkfacebook.com, lending strong credibility to it.

Facebook 2009 Demographic for United States

Good food for though. Google Ad Planner data is highly inaccurate? Anyone has any information on how Google Ad Planner data is compiled?