Advertising agency WPP completed a hat trick of acquisitions this week, with the focus this time switching from South Africa to Germany.The company has acquired the entire issued share capital of Spring Wirtz und Pischke, an information, insight and consultancy network, and has also snapped up Wirtz und Pischke Verwaltungsgesellschaft, a developer of systems to measure internet usage and performance of online advertising.The two companies will be integrated into WPP's wholly owned operating company Kantar.Spring's unaudited gross revenues for the year ended 31 December 2010 were €1.8m, with gross assets at the same date of €1.4m.The company counts blue chip organisations from the telecommunications, media and financial sectors amongst its extensive client portfolio, WPP said.