Yammer will establish a London office in Tech City, EC1, off the Cameron-christened ‘Silicon Roundabout’ that hosts many of the UK’s developing tech companies.

The San Francisco-based in-house social network company has over two million users, with more than 40% of its traffic coming from the EMEA region. The new London office will initially host 8 staff focusing on sales and client service for EMEA, doubling in size by the end of the year.

Yammer currently provides businesses with an in-house social networking platform that streamlines internal communications for organisations. As a free and private software solution that shares some traits with Facebook and Twitter, yet is aimed entirely at corporate communications, Yammer has fast become a popular tool for internal communicators.

UK users will now benefit from a client service team based in the UK and responding to the particular needs of the European market.

Its position in East London will concrete the area’s status as a fast-growing centre of technology in Europe, following David Cameron’s ambitions to transform the area into a rival to Silicon Valley.

“London was a natural choice for us thanks to its excellent links to the rest of the region and the high quality of talent in the area,” comments David Sacks, Yammer’s CEO. “The support of UKTI and London & Partners [the Government body responsible for encouraging foreign investment into the UK, and the Mayor of London’s promotional agency, respectively] has really helped streamline the process and made the establishment of our office simple and easy.”

Yammer will be based in TechHub, the shared working space for many young start ups, initially, but may move to its own dedicated premises in the area in the future.