They are preparing for a day of action next month when organisers hope to put up more than a million posters across the US under the "Kony 2017" slogan. The group was even able to get a resolution in the US Congress calling for more to be done to bring Kony to justice. The group's work was hailed as a triumph of online activism in the modern media age.

But critics jumped in too. Analysis of the group's accounts raised questions over financial transparency and just how the group was spending money, forcing Invisible Children to release a new video defending its operations. Some critics, including elements of the Ugandan government, slammed it for over-simplifying a complex problem, not least because Kony is no longer active in Uganda itself. Attention was paid to hefty donations to the group from rightwing American fundamentalist groups, including those who fund anti-gay rights campaigns. A photograph also emerged of the children's founders posing with guns with soldiers in southern Sudan, which sparked widespread criticism.

But no one can have expected the next twist in the story to take the shape it did, with Russell's apparent and very public naked meltdown.

Now, in a grim mirror image of the group's initial burst of viral internet success, Invisible Children's cause again trended on Twitter. Hollywood gossip website TMZ swiftly obtained an alleged video of the incident in which a naked, blond man can be seen shouting and angrily pounding the pavement with his fists. That video too has gone viral.

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