UberMedia, a developer of Twitter applications for mobile devices, on Thursday said that it completed a $5.6 million round of funding led by a unit of German investment firm Burda Digital.

The Pasadena company said the investment by DLD Ventures will help efforts to grow its user base in the United States and overseas. UberMedia apps, such as UberSocial, Echofon and Twidroyd, have about 5 million worldwide users who the company estimates are responsible for roughly 13 percent of all Twitter traffic.

UberMedia, a spinoff of tech incubator Idealab, has raised $26.6 million since its founding in March 2010. The developer has had a sometimes rocky relationship with San Francisco-based Twitter. The popular messaging platform temporarily blocked access by certain UberMedia apps in February, and UberMedia executives have hinted at plans to develop a rival messaging platform.

“We are in the midst of a tectonic shift toward social media by users all over the world, and the power of referral and information from people you trust is staggering,” Chief Executive Bill Gross said in a statement. “UberMedia’s goal is to drive innovation in the social media experience so that it becomes ever more engaging, relevant, and useful.”

Burda Digital, is based in Munich and has investments in more than 50 digital media companies in Europe and overseas. DLD Ventures is its international investment arm.