The U.S. Federal Trade Commission won't block Google's US$750 million acquisition of mobile advertising vendor AdMob because the deal isn't likely to harm competition in the emerging mobile advertising market, the agency said Friday.

Google has started supporting a click-to-call feature in AdWords on mobile smartphones.

Opera has acquired AdMarvel, which has developed a product suite that manages how ads are delivered to mobile phones, the Norwegian Web browser company said on Wednesday.

The importance of advertising as a revenue source for developers will grow as users become less willing to pay for mobile applications, according to market research company Gartner.

Google is introducing a mobile marketing campaign for Place Pages, a service for businesses that faced some early criticism when it launched in September.

IPhone and Android users may increasingly see ads appear in their phone applications, now that Google is expanding its advertising program for mobile applications.

Amazon search subsidiary A9 has acquired SnapTell, a company that lets mobile users take photos of products or advertisements to get special deals or more information.

Two privacy groups on Tuesday asked the U.S. Federal Trade Commission to regulate how mobile marketers can use consumers' personal information, saying many people don't know when their information is being collected from cell phones and how it's being used.