Nigerian President Buhari says a four month ban on Twitter will be lifted on condition it is used for "business and positive engagements" (Helen Nyambura/Bloomberg)

Helen Nyambura / Bloomberg:
Nigerian President Buhari says a four month ban on Twitter will be lifted on condition it is used for “business and positive engagements”  —  Nigerian President Muhammadu Buhari ordered a ban on Twitter be lifted on condition that the social-media platform is used for “business and positive engagements.”