The US government, acknowledging its limited success in combating Islamic extremist messaging, is recruiting tech companies, community organizations and educational groups to take the lead in disrupting online radicalization. The change in strategy, which took a step forward on Wednesday when the Justice Department convened a meeting with social media firms including Facebook Inc, Twitter and Alphabet Inc's Google , comes despite what critics say is scant evidence on the effectiveness of such efforts. The meeting was “a recognition that the government is ill-positioned ...