But then came headlines Twitter couldn’t ignore. In 2013, four gunmen stormed Nairobi’s Westgate shopping mall, murdering 67 people and wounding nearly 200 more. The attackers belonged to Al-Shabaab, an East African terror organization whose members had been early and obsessive Twitter adopters. Shabaab applied digital marketing savvy to the attack, pumping out a stream of tweets, press releases, and even exclusive photos (snapped by the gunmen themselves). “#Westgate: a 14-hour standoff relayed in 1400

