/// <summary>
 /// Legacy feed share. Only use this dialog if you need the legacy parameters otherwiese use
 /// <see cref="FB.ShareLink(System.String, System.String, System.String, System.String, Facebook.FacebookDelegate"/>.
 /// </summary>
 /// <param name="toId">
 ///     The ID of the profile that this story will be published to.
 ///     If this is unspecified, it defaults to the value of from.
 ///     The ID must be a friend who also uses your app.
 /// </param>
 /// <param name="link">The link attached to this post.</param>
 /// <param name="linkName">The name of the link attachment.</param>
 /// <param name="linkCaption">
 ///     The caption of the link (appears beneath the link name).
 ///     If not specified, this field is automatically populated
 ///     with the URL of the link.
 /// </param>
 /// <param name="linkDescription">
 ///     The description of the link (appears beneath the link caption).
 ///     If not specified, this field is automatically populated by information
 ///     scraped from the link, typically the title of the page.
 /// </param>
 /// <param name="picture">
 ///     The URL of a picture attached to this post.
 ///     The picture must be at least 200px by 200px.
 ///     See our documentation on sharing best practices for more information on sizes.
 /// </param>
 /// <param name="mediaSource">
 ///     The URL of a media file (either SWF or MP3) attached to this post.
 ///     If SWF, you must also specify picture to provide a thumbnail for the video.
 /// </param>
 /// <param name="callback">The callback to use upon completion.</param>
 public static void FeedShare(
     string toId            = "",
     Uri link               = null,
     string linkName        = "",
     string linkCaption     = "",
     string linkDescription = "",
     Uri picture            = null,
     string mediaSource     = "",
     FacebookDelegate <IShareResult> callback = null)
 {
     FacebookImpl.FeedShare(
         toId,
         link,
         linkName,
         linkCaption,
         linkDescription,
         picture,
         mediaSource,
         callback);
 }