Roberto Schmidt

When an avalanche thundered down Mount Everest last weekend, guides tweeted calls for help and dramatic video footage quickly went viral as trekkers accessed wifi on the roof of the world.

The so-called selfie short for self-portrait went viral on social media sites, with many questioning whether the moment of mirth was appropriate for the occasion.

US President Barack Obama may have moved the masses attending Nelson Mandela's memorial service with his stirring eulogy on Tuesday, but it was his grinning "selfie" with the Danish and British premiers that set social networks abuzz.

When an avalanche thundered down Mount Everest last weekend, guides tweeted calls for help and dramatic video footage quickly went viral as trekkers accessed wifi on the roof of the world.

The so-called selfie short for self-portrait went viral on social media sites, with many questioning whether the moment of mirth was appropriate for the occasion.

US President Barack Obama may have moved the masses attending Nelson Mandela's memorial service with his stirring eulogy on Tuesday, but it was his grinning "selfie" with the Danish and British premiers that set social networks abuzz.