Nigeria's President Goodluck Jonathan has used his Facebook page to announce his candidacy for presidential elections next January, ending months of speculation over his intentions. He will make a formal declaration at a rally on Saturday. On Wednesday, he wrote on his Facebook page, "Today, I confirm that after wide and thorough consultations spanning the six geo-political zones that make up Nigeria, with members of my family, my party, the opposition, civil society, the Private Sector, members...