more gruesome, displaying the corpses of beheaded members alleged to have been spies. Propaganda films are also occasionally used to attempt to mobilise jihadi activity abroad: in October 2013, one film encouraged British jihadists to follow the example set by Lee Rigby's killers, while a February 2015 film called (without effect) for attacks on shopping malls in Canada, the United Kingdom, and the United States, including the West Edmonton Mall in Alberta, Canada, and the Mall of America in Bloomington, Minnesota. Internet and social media Al-Shabaab was an early adopter among African insurgents of the Internet, which it uses to distribute its propaganda videos and for various other propaganda functions. Especially in its early years, it used online chatrooms and discussion forums, encouraging foreign fighters and even military commanders to post updates and field public questions about the state of the jihad. Particularly prominent was American-born Omar Shafik Hammami, also known as Abu Mansoor Al-Amriki, who for many years kept a video blog about his life in al-Shabaab and who, from 2009, also created and posted raps about jihad. Al-Shabaab also had an official website, which carried official statements and news – including sundry edicts and threats – and religious guidance. Since the site was closed in 2009, it has distributed its press releases and videos using other sympathetic websites, or, more commonly, using social media networks. Indeed, although al-Shabaab spokesmen occasionally grant interviews to "carefully selected" local and foreign journalists, social media networks have provided an important channel for interaction with the press, as well as for disseminating information and building support. Al-Shabaab has used Facebook, particularly to communicate with the Somali diaspora; and it has made prolific and innovative use of Twitter since late 2011, although its first accounts were active as early as 2009. Online engagement with al-Shabaab surged during Operation Linda Nchi, the Kenyan offensive of 2011–12, when al-Shabaab used Twitter, under the handle @HSMPress, to urge Somalis to take up arms against the Kenyan forces and to portray its own military losses as tactical retreats. In an extreme example of the latter in late 2011, al-Shabaab photos purportedly showed several dozen AMISOM casualties – but, according to an African Union spokesperson, in fact showed al-Shabaab's own casualties dressed in their adversaries' uniforms. What received most attention, however, were tweets al-Shabaab posted mocking the Kenya Defence Forces (KDF) and sparring with Major Emmanuel Chirchir, then the