Social Gaming Company, Vodafone Open Offices in London's Tech City

The growing tech hub in East London, near the Olympic Stadium, also announced the arrival of several other companies.

LONDON - The announcements come after Amazon and Facebook revealed developments in the capital. While those two sites are outside the Tech City area, they have helped promote the idea that London can attract the world’s biggest digital companies.

GREE, the Japanese mobile games company, is planning a development studio.

Earlier this year Google made a multimillion investment in Tech City when it opened its Campus building, where start-up businesses can access inexpensive or even free office space.