A fake battle, invented in a hail of tweets by a London man, has tricked both so-called Islamic State's supporters, and their opponents, supporters of Shia militia fighters in Iraq.It was supposedly an intense battle involving Islamic State and Shia and Iraqi government fighters. Soon after the news broke, Twitter users that back anti-IS forces claimed a famous victory. "Big celebrations in Karbala after the freedom of Shichwa," said one. Another claimed "10,000 refugees flee Shichwa to Karbala" and rumours spread that neighbouring countries were being dragged into the fighting: "Disaster: the Saudi Army must quickly mobilize to the Iraqi border."But the battle of Shichwa never actually happened - in fact, Shichwa isn't even a real place.