Radar Networks was a San Francisco–based company that aimed to develop Semantic Web applications for the general public.

The company was founded in 2003 by web entrepreneur Nova Spivack, grandson of Peter Drucker, and AI researcher Kristinn R. Thórisson.

In February 2008 the company raised a Series B venture round led by Velocity Interactive Group, Vulcan Capital and Draper Fisher Jurvetson.

The company's only product, Twine, was an online, social web service that was opened to the public on October 21, 2008.

[3] On March 11, 2010, Radar Networks was acquired by Seattle-based[4] Evri Inc.[2] On May 14, 2010, Twine was shut down, becoming a redirect to evri.com.