To prevent further acts of violence. The authorities in chile say more than a Million People have been taking part in a march through the streets of santiago calling for measures to reduce inequality. 0rganisers say its the biggest demonstration chiles ever seen. Many are calling for the resignation of the countrys president. In a moment here on bbc news newswatch. But first heres click. Every single day we upload 4 million hours of video to youtube. We send 682 million tweets. We post over 67 million instagram pictures. 4. 4 billion of us use the internet. And collectively, we create 2. 5 exa bytes, that is collectively, we create 2. 5 exabytes, that is 2. 5 million tb or 2. 5 quintillion bytes of data every single day. And a significant proportion of all the data, surges, social media, video streaming, goes through here. This is telehealth stock, one of the most important parts of the internet backbone. It is one of four buildings here in london full of computers, cables, cooling equ