Irish rockers U2 have revealed a new social media that allows concert goers to tag themselves in the audience via email, Twitter or Facebook.
Last year the Orange, a brand of France Télécom used a similar system. They used a high-powered camera that allows you to zoom on every single fan in the stadium.
At U2's concert in Johannesburg earlier this month a photograph like this was taken. This massive image allows users to zoom into the crowd and see if they can spot themselves. They can then tag their images.
These panoramic images are taken with what is known as a Gigapixel camera.