“Nigeria’s Boko Haram swore allegiance recently to the Islamic State in an audio message with French and English subtitles. What most failed to notice was a few weeks earlier an ’emissary’ of Islamic State sent a public invitation to the emir of al-Shabab in Somalia, Abu Ubaidah, urging him to do the same.”
Source: Islamic State eyes East Africa – and foments division – Africa – Stripes