8,000 people are getting together to meet their online video idols.
The UK's biggest YouTube festival, Summer in the City, is being held at Alexandra Palace.
The event was set up by vloggers and allows those YouTube stars - many of whom are hugely popular - the opportunity to perform in a live setting, often in front of the biggest audience of their lives. The fans can watch their favourite musicians, comedians, video bloggers and filmmakers on the main stage, but also meet them face to face to get a selfie or an autograph.
Summer in the City is an annual event that brings YouTube stars from across the world together with content creators, fans and industry personnel for the UK's largest celebration of all things YouTube. The weekend features live performances, talks and many opportunities for fans and content creators to connect with each other and meet their favourite YouTubers.
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Faulty fuse boxes are causing five house fires a week in the capital, according to new figures by the London Fire Brigade.
They say defective wiring and components are behind the problem. New regulations are being announced which will require them to be flame proof from 2015.
There's been a five fold increase in fires started by fuse boards over five years.
It's believed the increase is because many homes have installations subject to product recall.
Also, sometimes the wiring is not fitted properly at the time the unit is installed.
Find out here if your fuse box unit is on the London Fire Brigade recall list.
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Passengers will gain access to WiFi at six more London Underground stations, Transport for London has revealed.
A partnership between Transport for London and Virgin Media has led to the installation of WiFi at more than 100 stations already in the capital.
Commuters at Golders Green, Southgate, West Kensington, Parsons Green, Kilburn and East Putney will be able to access their emails and social media even when on platforms and in the absence of mobile phone coverage.
Virgin Media said more than 800,000 devices have connected to the networks so far as customers take advantage of a deal between the major UK mobile networks, including EE, O2 and Vodafone, meaning that users of those services can connect to the WiFi at no extra cost.
TfL announced earlier this week that commuters will be able to use smartphones to pay for Tube travel by the end of the year in the latest technological development in the capital.
A shortage of skills, including a lack of students with good maths and science, is threatening the capital's position as the global hub for technology, say business experts.
The Tech London Advocates add that immigration controls are also stopping talent from outside the UK coming in. 172 of their members said they had difficulty finding employees that meet their requirements which, they say, is having a serious impact on the growth of London's technology industry.