Algo's use Twitter

 These days some algos trade on the back of news sites, and even what is trending on social media sites such as Twitter, so a deluge of negative Brexit headlines could have led to an algo taking that as a major sell signal for sterling. Once the pound started moving lower then more technical algos could have followed suit, compounding the short, sharp, selling pressure. Thus, the pound has been the victim of the digital, headline-driven world that we live in today