Twitter announced ad groups, a new tool which provides advertisers to have further control over how to spend their budgets and message different audiences. As one campaign can have many ad groups, and as ad groups can have many targeting criteria, the ad groups tool can help you better organize and optimize your campaign. With ad groups, advertisers can test different audiences, set promotion schedules, and find out which Tweets work best. This tool enables you to create, test, and measure several campaigns at the same time. Ad groups are available to all advertisers in the Ads editor tool section.