The International Criminal Court's chief prosecutor has said he supports a new campaign to capture alleged Ugandan war criminal Joseph Kony.
Louis Moreno Ocampo said the social media campaign by Invisible Children had "mobilised the world".
The US group's half-hour film on the use of child soldiers by Kony's Lord's Resistance Army has been viewed nearly 20 million times on YouTube.
However, critics have questioned the campaign's content and credibility.
The group aims to bring Kony to justice at the ICC, where he is charged with crimes against humanity.
But bloggers accused Invisible Children of spending most of its raised funds on salaries, travel expenses and film-making.