Abstract: A method of comparing a first raster to a second raster includes determining, for pairs of corresponding regions (for example, individual pixels) of the first raster and second raster, a comparison value between the corresponding regions of the first and second raster. For each comparison value, a color code is assigned based on a value of the comparison value. A comparison raster is generated from the color-coded comparison values. The comparison raster is presented to a reviewer.

Abstract: A user may post items that are associated with multimedia objects, such as audio files and video files. The posted items are automatically added to the dynamic playlists of other users who are “following” the user. A user's dynamic playlist is provided to that user for viewing and for accessing the multimedia objects associated with the items in the dynamic playlist. One user may give another user a particular amount of social currency, and a particular's user's total amount of social currency received through gifts is maintained and displayed in a profile of the particular user. A user may create and modify certain tag settings that are used to filter a plurality of multimedia objects such that only the multimedia objects that satisfy the user's tag settings are provided to the user.