A system may selectively deliver interactive portions of a piece of content, based for example on a recipient user's historical tendency to use interactive portions of prior content. Multiple levels of interactivity may be defined for a given piece of content, such as an advertisement, and different users may receive different levels of interactivity based on how much they use interactive features. Some users may receive no interactive features at all, while others may receive the interactive features, and despite the fact that all of the users' devices may be perfectly capable of processing the interactive features for the user. The omission from transmission may conserve bandwidth and transmission resources.