Senior US officials have praised the biometric voting process used in Nigeria's recent election while warning that any Nigerians accused of either disrupting the vote will face visa restrictions.US Assistant Secretary of State for African Affairs, Linda Thomas-Greenfield, said that overall new innovations had improved the electoral process on 28-29 March 2015.”Despite some technical glitches, it is clear that technology and use of social media-INEC's online posting of results for each polling unit, live tweeting of results, the use of biometric permanent voter cards and electronic card readers improved efficiency and limited fraud.”She also commended the Independent National Electoral Commission, INEC, and its chairman, Prof. Attahiru Jega, and encouraged Nigeria and other nations to continue to explore the use of relevant technologies in future elections.However, Thomas-Greenfield said Washginton it will impose visa restrictions on any Nigerian found to have incited violence or interfered with the electoral process.The biometric voting process in Nigeria's vote in March got off to a shaky start with President Goodluck Jonathan's readers malfunctioning on the first day, and further technical issues forced the INEC to extend voting to a second day.