Joining WPP in Visible Technologies' round were the US intelligence agencies' In-Q-Tel quasi-corporate venturing unit, venture capital firms Investor Growth Capital and Ignition Partners and an angel investor.

Visible Technologies, a US-based provider of social intelligence services, has raised $6m from a consortium including the world’s largest advertising company.

Joining WPP in the round were the US intelligence agencies’ In-Q-Tel quasi-corporate venturing unit, venture capital firms Investor Growth Capital and Ignition Partners and an angel investor.

Kelly Pennock, chief executive of Visible Technologies since October after his promotion from chief technology officer, said: "This strategic investment will allow us to accelerate the adoption and success of the…