A temporal layer containing personalization markers (e.g., placemarks) created by a user at a given time (or time period), can be combined with map imagery, allowing the user (or other users) to show only the personalization markers contained in the temporal layer. Temporal layers can be of arbitrary temporal or geographical size, fully or partially overlapping in time or space, split into smaller temporal layers, logically aligned or combined and/or continuous or non-continuous in time or space. Temporal layers can be stored in a repository where they can be searched and used by others. Temporal layers can be associated with search services (e.g., news search) or search histories (e.g., automatic temporal layers based on search history). A user's personal profile can be compared with other users' personal profiles and the results of the comparison can be used to recommend temporal layers. Advertisements can be associated with temporal layers.