While the primary business interest is in the web content arena, Google has begun experimenting with other markets, such as radio and print publications. On 17 January 2006, Google announced the purchase of a radio advertising company "dMarc", which provides an automated system that allows companies to advertise on the radio. This will allow Google to combine two niche advertising media—the Internet and radio—with Google's ability to laser-focus on the tastes of consumers. Google has also begun an experiment in selling advertisements from its advertisers in offline newspapers and magazines, with select advertisements in the Chicago Sun-Times. They have been filling unsold space in the newspaper that would have normally been used for in-house advertisements.