Abstract: Exemplary methods, apparatuses, and systems for event planning and management are detailed. In some embodiments, a method includes receiving a plurality of selectable actions and associated media element content for an event, generating a media event comprising one or more of the received media elements, and transmitting the media event to an event recipient on a date of the event.

Abstract: An online system includes a method for identifying content to provide to a user of the online system. The online system receives a request to present content to users of the online system. The request may include a hierarchy of moments, wherein each moment of the hierarchy of moments is associated with a content creative. The online system identifies an impression opportunity to present the content to a user of the online system. The online system identifies a set of candidate moments occurring for the user from the hierarchy of moments. The online system selects a moment from the set of candidate moments based on the hierarchy of moments. The online system finally identifies the content creative associated with the identified moment, and then presents the content creative to the user.

Abstract: Exemplary methods, apparatuses, and systems for event planning and management are detailed. In some embodiments, a method includes receiving a plurality of selectable actions and associated media element content for an event, generating a media event comprising one or more of the received media elements, and transmitting the media event to an event recipient on a date of the event.

Abstract: An online system receives information from an entity identifying a set of users of the online system and groups users included in the set into clusters based on their similarities using a clustering model or algorithm (e.g., k-means clustering) and based on one or more parameters specified by the entity. The online system generates expanded clusters that include additional users in one or more clusters based on similarities between the additional users and users in various clusters. If an additional user is included in multiple expanded clusters, the online assigns the additional user exclusively to an expanded cluster that best fits the user.