If you have a lot of content to promote, you can partially automatize your effort by utilizing rotation of the marketing campaigns. This feature works especially well if you fetch your content from external sources.
As the name suggests, if you set up several alternatives (added by clicking on Add alternatives in the campaign details) to Regular rotation and they will periodically change in the set sequence. The highlighted alternative will be used during the closest signature set-up.
If you set them to Random rotation, they will change on a random basis - even the individual users will have different alternatives applied.
If you wish, you can turn this feature Off; this is also the default option. You can add up to seven alternatives to your campaign.