Trending rights tweets this week: In a country that is often described as the most repressive in the world, a country without light at night, human rights should be a central feature of all negotiations with North Korea; the bold-faced hypocrisy of Saudi Arabia’s crown prince was on full display, cracking down on women’s rights activists shortly after a "reformist" tour of world capitals; US authorities are separating children from their parents; and 15 must see human rights films.