First of all, Now a days there is no need to advertisement for facebook because Facebook is totally up in the market but for improve the facebook according to my view first step i want create some division for adult and child ..i have one idea for child to grow more in facebook..Child(age <15) have to just login with their id and use different application and play different mind games and participate in different activity..they have some criteria in their profile like they can not see adult photoes, Adult games or etc.. THank u