1. A method comprising: enabling, at a first social network platform implemented using the database system, communications channels between the first social network platform and a plurality of social network platforms external to the first social network platform, the communications channels permitting communications according to a protocol between the first social network platform and the external social network platforms, the communications comprising application programming interface (API) requests from the first social network platform to the external social network platforms, each social network platform being maintained on behalf of a respective social network provider; retrieving, by the first social network platform, by sending a plurality of first API requests to the external social network platforms, a plurality of social media messages from the external social network platforms, the social media messages capable of being stored as data objects in at least one database of the database system; providing, by the first social network platform, the social media messages to a user device associated with a user of the first social network platform, the social media messages configured to be processed by the user device to present the social media messages in a message stream of a user interface displayable on a display of the user device; receiving, at the first social network platform, an indication from the user device of first user input selecting a first one of the social media messages; identifying, by the first social network platform, one of the external social network platforms from which the first social media message was retrieved; determining, by the first social network platform, a plurality of message actions according to the identified external social network platform, the determined message actions being social media-related actions provided by the identified external social network platform; providing, by the first social network platform, information identifying the determined message actions to the user device, the information configured to be processed by the user device to present the determined message actions in an actionable menu of the user interface; receiving, at the first social network platform, an indication from the user device of second user input selecting at least one of the determined message actions; and requesting, by the first social network platform, by sending at least one second API request to the identified social network platform, performance of the selected at least one message action.