O.k., Let me re-phrase the question.
Do any mature adults use this ?
If by 'mature' you mean old: 8,450,000 are 55 and older.
If by 'mature' you mean mentally mature; 40% of F/B users have college degrees; 13% have graduate degrees; F/B user college degrees
compared to the average population in America of 27.7% with college degrees and 9.4% with advanced degrees.
If by 'mature' you mean negative grizzled old dinosaurs who are so stuck in the rut of their personal drab, meaningless existence that they are unwilling to learn and adapt to something new even when it's the most dominant communication tool in the world today so they anonymously sit back and snidely criticize all the new things they don't understand.
Nope. Not one.....(8 ^P