|`Update`|`Object`|Only the actor's own actor object can be updated|
|`Update`|`Object`|
As far as the `Create` activity is concerned, only `Note` is a first-class citizen in Mastodon, because Mastodon is a microblogging engine. For other types of supported objects, Mastodon internally creates a toot representation, for example, an `Article` becomes a toot with the `title` and `url` of the original object, as users are expected to navigate to the original URL to read the article with rich text formatting. For `Image` and `Video` objects, the `title` is likewise used to fill the content of the toot, with the original file attached to the toot.
The `Flag` activity allows reporting content on another server, and its `object` can be either one or more actors, or one or more objects attributed to various actors. The `Add` and `Remove` activities only work with [featured collections](#featured-collection). The `Delete` activity can be used to delete all local data of the sender when the `object` of it is the sender. The `Update` activity can only be used to update the profile of the sender. Likewise, the `Move` activity allows re-assigning followers from the sender (`object`) to another actor (`target`), but only if the other actor references the sender in the `alsoKnownAs` property.
