A database system operates a feed system and communicates with different remote computing devices associated with different users. The database system may display feed items from the feed system on the remote computing devices and enable users to author new posts to the feed system. An authoring tool supports creation of new posts, and provides transparency as to which users will have access to the post. The authoring tool supports managing intended recipients, including users, groups, topics, files, and other entities. The authoring tool creates, and shows to the author, an automatic summary of recipients before the post is added to the feed system.