     /// The identifier of the Facebook page being posted to.
     public let destination: Int
 
-    /// The Facebook category of the video.
+    /// The Facebook category of the video. May be `nil`.
     public let categoryID: String?
 
     /// Whether or not this Facbeook post should be embeddable.

    /// The title of the video as it will appear on YouTube.
    public let title: String

    /// The description of the video as it will appear on YouTube.
    public let description: String?

    /// A list of tags for the video on YouTube. May be nil.
    public let tags: [String]?

    /// The privacy option for this video on YouTube.
    public let privacy: Privacy

    /// The YouTube category identifier which this video falls into. May be nil.
    public let categoryID: String

    public init(

    /// The title of the post as it will appear on LinkedIn.
    public let title: String

    /// The description of the post as it will appear on LinkedIn. May be `nil`.
    public let description: String?

    public init(
