Instagram Modem

I need a special modem can run custom software , the modem (switch) connect to internet via adsl or ethernet, when the users connect to wifi it will open special instagram page (changeable)and ask the user to follow or like , if the user follow or like the page, the modem will give internet access to the user. otherwise close the connectıon or disable accsess to internet. also you can suggest modem, technology... etc. thanks