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.. https://play.google.com/

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