Business social network Yammer has announced that is to open its first developer centre outside of the US in London's Tech City, and has plans to increase its workforce in London to over 130 people across all divisions.

The news was announced by Kulveer Ranger, the Mayor of London's director of environment and digital London, at this week's Digital London conference.

“Yammer is a fantastic organisation and business tool,” said Ranger. “We've seen off New York to get that centre here, and they're also investing in R&D here in London. That's a big feather in our cap and shows where London is.”

Yammer's general manager for EMEA, Georg Ell, said that the company had chosen London as its European base because of the large talent pool of engineers, developers and customer-facing teams.

“We’re focused on hiring very talented and committed people to grow our high performing culture focused on just two things: building a great product that people love to use, and a relentless focus on customer success,” said Ell. “London is the ideal place to do that, and we’ve had tremendous support from all involved in the Tech City initiative, especially London and Partners.”

Ranger also announced at the Digital London event that White Horse Capital, which runs an accelerator academy, has secured £35 million for its accelerator fund, which will be deployed as seed capital for startups in London over the next five years.

Meanwhile, Google has confirmed plans open a new building dedicated to startups in East London's Tech City. The company will be working with Tech City organisations such as Tech Hub, Springboard, the mentorship-led accelerator program for start-ups, and micro seed fund Seedcamp, to work out how to support entrepreneurs using the building.