Most probably Facebook didn't make the games themselves. And I thought one had to be at least 13 years to use Facebook, but probably some parents are allowed younger kids access.
Really? I thought the presence of the brand was bigger (back in the day) than that would allow for. An average age of 5 puts a pretty sharp limit on the number of 30-year-olds who can play. They're not going to be balanced out by one -20-year-old each.