Abstract: The present invention relates to systems and methods for providing advertisements on websites. In an embodiment, a method for providing an advertisement on a website includes obtaining user-sourced information regarding a future event, analyzing the content of the user-sourced information to identify a characteristic of at least one of a product or service relevant to the future event, comparing the characteristic to a descriptor associated with a list-based advertisement, and selecting the list-based advertisement for display on a website visited by the user when the characteristic matches the descriptor associated with the advertisement.

Abstract: Methods, systems, and apparatus, including computer program products, may be used for sharing revenue associated with a multimedia object. A content item on a web page that includes one or more advertisements may be identified along with an owner identification and a sharing level associated with the content item. The owner identification is associated with an owner account. A web page revenue amount generated from the one or more advertisements on the web page is calculated along with a share revenue amount based on the web page revenue amount and the sharing level, and the share revenue amount is applied to the owner account.

Abstract: General instructions for formatting advertisements are identified, content for a specific advertisement is identified, and the specific advertisement is displayed on a medium according to the identified formatting instructions. In connection with offering to publish advertisements, a CSS file is identified to be used to format the advertisements.

Abstract: Methods, systems, and apparatus, including computer program products, may be used for identifying context. Web attributes associated with a first instance of a content item displayed on a first web page may be identified along with a second web page displaying a second instance of the content item. Context information may be determined using the web attributes, and the context information may be associated with the second web page.

Abstract: Methods, systems, and apparatus, including computer program products may be used for controlling use of a content item. A tag may be applied to a content item. The tag may include at least a unique identifier associated with the content item. When a first indication of a selection of the content item is received, the tag may be used to identify a sharing level associated with the content item and to control use of the content item based on the sharing level associated with the content item.