The general greetings trending the start of Ramadan is Ramadan Mubarak or Ramadan Kareem. I received a few on my Whatsup. But as it appears it doesn’t mean anything except taking it in its true sense per Quran i.e. lets empower ourselves against evil. So if we are not kidding each other, a genuine greeting should be my 'Iman Mubarak’ to you for goodness and vice versa.