AMSTERDAM (JTA) — As a supporter of boycotting Israel, Mieke Zagt had no intention of marketing Israeli wine when she posted on Twitter a picture of the wine on sale at the Hema Dutch supermarket chain. But her tweet, meant to protest the sale, prompted Israel supporters here to mount a social media reaction so successful that the Israeli wines sold out at the Hema stores and the campaign became the No. 1 trending topic Tuesday on Dutch Twitter. The opening shot for the #tipvanMieke campaign was a tweet that Zagt, a scholar and Electronic Intifada contributor with fewer than...