1. A method involving frames of imagery depicting a first subject, captured using a camera portion of a mobile phone device, and displayed on a screen of said device, the method comprising: producing an identifier related to said first subject, by analyzing captured image data; displaying a first tag on the screen with a first frame of imagery, the first tag being located at a first position on the screen, the first tag being user-selectable to initiate an action associated with the first subject; presenting a visual indicia on the screen that associates the first subject as depicted in the first frame, with the displayed first tag; displaying said first tag on the screen with a second frame of imagery that depicts the first subject; wherein the first subject is depicted at different locations within the first and second frames of imagery, yet the first tag is displayed at said first position on said screen with both the first and second frames of imagery.