The band played a 30-minute set at the Westfield London site, which was aired live at both venues. Really Creative Media broadcast the show to numerous web streams, including Facebook, Digital Spy and Sugarscape.
Across London at Stratford City, fans gathered for a meet and greet session enhanced by Hashtag Live, a new Twitter monitoring and display service, which displayed messages to the band and attendees on 90-inch screens at both venues.
Fiona Kyle, general manager of events and entertainment at Westfield London, said: "We were delighted with the success of the event and how its exposure was maximised through live streaming and social media. Fans got involved on Twitter, posting images of themselves with The Vamps and posing questions for their favourite members.
"Hashtag Live was a fantastic tool for managing the queuing fans over at Westfield Stratford City, who were excited to see their Tweets appear on a large screen above the queue. It was a great marketing tool, allowing brands to tap virtually into the experience, posting their messages and pictures to the live Twitter stream."
Nick Dew, managing director of Really Creative Media, also commented: "Technology is increasingly being drawn upon to increase engagement and reach of live events. As The Vamps only performed to selected winners chosen from an email ballot, it was significant that the event could be extended through a live broadcast to facilitate those who could not be there to share the experience."
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