How is the app different from the mainstream q&a social apps like

Quora https://play.google.com/store/apps/details?id=com.quora.andr.... or

ask.fm https://play.google.com/store/apps/details?id=com.askfm&hl=e.... or

kiwi.qa https://play.google.com/store/apps/details?id=com.chatous.po.... ?