diff --git a/src/Discord.Net.Core/Entities/Guilds/IGuild.cs b/src/Discord.Net.Core/Entities/Guilds/IGuild.cs
index b39a49776..cdf0118c4 100644
--- a/src/Discord.Net.Core/Entities/Guilds/IGuild.cs
+++ b/src/Discord.Net.Core/Entities/Guilds/IGuild.cs
@@ -683,6 +683,9 @@ namespace Discord
         /// <summary>
         ///     Downloads all users for this guild if the current list is incomplete.
         /// </summary>
+        /// <remarks>
+        ///     This method downloads all users found within this guild throught the Gateway and caches them.
+        /// </remarks>
         /// <returns>
         ///     A task that represents the asynchronous download operation.
         /// </returns>
diff --git a/src/Discord.Net.Core/Entities/Messages/IUserMessage.cs b/src/Discord.Net.Core/Entities/Messages/IUserMessage.cs
index bc52dd01c..e2fb25aae 100644
--- a/src/Discord.Net.Core/Entities/Messages/IUserMessage.cs
+++ b/src/Discord.Net.Core/Entities/Messages/IUserMessage.cs
@@ -57,6 +57,21 @@ namespace Discord
         /// </returns>
         Task UnpinAsync(RequestOptions options = null);
 
+        /// <summary>
+        ///     Publishes (crossposts) this message.
+        /// </summary>
+        /// <param name="options">The options to be used when sending the request.</param>
+        /// <returns>
+        ///     A task that represents the asynchronous operation for publishing this message.
+        /// </returns>
+        /// <remarks>
+        ///     <note type="warning">
+        ///         This call will throw an <see cref="InvalidOperationException"/> if attempted in a non-news channel.
+        ///     </note>
+        ///     This method will publish (crosspost) the message. Please note, publishing (crossposting), is only available in news channels.
+        /// </remarks>
+        Task CrosspostAsync(RequestOptions options = null);
+
         /// <summary>
         ///     Transforms this message's text into a human-readable form by resolving its tags.
         /// </summary>
diff --git a/src/Discord.Net.Rest/DiscordRestApiClient.cs b/src/Discord.Net.Rest/DiscordRestApiClient.cs
index a726ef75d..732cb5f17 100644
--- a/src/Discord.Net.Rest/DiscordRestApiClient.cs
+++ b/src/Discord.Net.Rest/DiscordRestApiClient.cs
@@ -695,6 +695,15 @@ namespace Discord.API
             var ids = new BucketIds(channelId: channelId);
             await SendAsync("POST", () => $"channels/{channelId}/typing", ids, options: options).ConfigureAwait(false);
         }
+        public async Task CrosspostAsync(ulong channelId, ulong messageId, RequestOptions options = null)
+        {
+            Preconditions.NotEqual(channelId, 0, nameof(channelId));
+            Preconditions.NotEqual(messageId, 0, nameof(messageId));
+            options = RequestOptions.CreateOrClone(options);
+
+            var ids = new BucketIds(channelId: channelId);
+            await SendAsync("POST", () => $"channels/{channelId}/messages/{messageId}/crosspost", ids, options: options).ConfigureAwait(false);
+        }
 
         //Channel Permissions
         public async Task ModifyChannelPermissionsAsync(ulong channelId, ulong targetId, ModifyChannelPermissionsParams args, RequestOptions options = null)
diff --git a/src/Discord.Net.Rest/Entities/Messages/MessageHelper.cs b/src/Discord.Net.Rest/Entities/Messages/MessageHelper.cs
index b29eca62e..57f8b2509 100644
--- a/src/Discord.Net.Rest/Entities/Messages/MessageHelper.cs
+++ b/src/Discord.Net.Rest/Entities/Messages/MessageHelper.cs
@@ -44,8 +44,10 @@ namespace Discord.Rest
             };
             return await client.ApiClient.ModifyMessageAsync(msg.Channel.Id, msg.Id, apiArgs, options).ConfigureAwait(false);
         }
+
         public static Task DeleteAsync(IMessage msg, BaseDiscordClient client, RequestOptions options)
             => DeleteAsync(msg.Channel.Id, msg.Id, client, options);
+
         public static async Task DeleteAsync(ulong channelId, ulong msgId, BaseDiscordClient client,
             RequestOptions options)
         {
@@ -115,6 +117,7 @@ namespace Discord.Rest
         {
             await client.ApiClient.AddPinAsync(msg.Channel.Id, msg.Id, options).ConfigureAwait(false);
         }
+
         public static async Task UnpinAsync(IMessage msg, BaseDiscordClient client,
             RequestOptions options)
         {
@@ -240,6 +243,7 @@ namespace Discord.Rest
 
             return tags.ToImmutable();
         }
+
         private static int? FindIndex(IReadOnlyList<ITag> tags, int index)
         {
             int i = 0;
@@ -253,6 +257,7 @@ namespace Discord.Rest
                 return null; //Overlaps tag before this
             return i;
         }
+
         public static ImmutableArray<ulong> FilterTagsByKey(TagType type, ImmutableArray<ITag> tags)
         {
             return tags
@@ -260,6 +265,7 @@ namespace Discord.Rest
                 .Select(x => x.Key)
                 .ToImmutableArray();
         }
+
         public static ImmutableArray<T> FilterTagsByValue<T>(TagType type, ImmutableArray<ITag> tags)
         {
             return tags
@@ -279,5 +285,14 @@ namespace Discord.Rest
                 return MessageSource.Bot;
             return MessageSource.User;
         }
+
+        public static Task CrosspostAsync(IMessage msg, BaseDiscordClient client, RequestOptions options)
+            => CrosspostAsync(msg.Channel.Id, msg.Id, client, options);
+
+        public static async Task CrosspostAsync(ulong channelId, ulong msgId, BaseDiscordClient client,
+            RequestOptions options)
+        {
+            await client.ApiClient.CrosspostAsync(channelId, msgId, options).ConfigureAwait(false);
+        }
     }
 }
diff --git a/src/Discord.Net.Rest/Entities/Messages/RestMessage.cs b/src/Discord.Net.Rest/Entities/Messages/RestMessage.cs
index f457f4f7a..b4a33c76c 100644
--- a/src/Discord.Net.Rest/Entities/Messages/RestMessage.cs
+++ b/src/Discord.Net.Rest/Entities/Messages/RestMessage.cs
@@ -165,7 +165,7 @@ namespace Discord.Rest
         IReadOnlyCollection<IEmbed> IMessage.Embeds => Embeds;
         /// <inheritdoc />
         IReadOnlyCollection<ulong> IMessage.MentionedUserIds => MentionedUsers.Select(x => x.Id).ToImmutableArray();
-       
+
         /// <inheritdoc />
         public IReadOnlyDictionary<IEmote, ReactionMetadata> Reactions => _reactions.ToDictionary(x => x.Emote, x => new ReactionMetadata { ReactionCount = x.Count, IsMe = x.Me });
 
diff --git a/src/Discord.Net.Rest/Entities/Messages/RestUserMessage.cs b/src/Discord.Net.Rest/Entities/Messages/RestUserMessage.cs
index 7d652687a..ad2a65615 100644
--- a/src/Discord.Net.Rest/Entities/Messages/RestUserMessage.cs
+++ b/src/Discord.Net.Rest/Entities/Messages/RestUserMessage.cs
@@ -148,6 +148,18 @@ namespace Discord.Rest
             TagHandling roleHandling = TagHandling.Name, TagHandling everyoneHandling = TagHandling.Ignore, TagHandling emojiHandling = TagHandling.Name)
             => MentionUtils.Resolve(this, 0, userHandling, channelHandling, roleHandling, everyoneHandling, emojiHandling);
 
+        /// <inheritdoc />
+        /// <exception cref="InvalidOperationException">This operation may only be called on a <see cref="RestNewsChannel"/> channel.</exception>
+        public async Task CrosspostAsync(RequestOptions options = null)
+        {
+            if (!(Channel is RestNewsChannel))
+            {
+                throw new InvalidOperationException("Publishing (crossposting) is only valid in news channels.");
+            }
+
+            await MessageHelper.CrosspostAsync(this, Discord, options);
+        }
+
         private string DebuggerDisplay => $"{Author}: {Content} ({Id}{(Attachments.Count > 0 ? $", {Attachments.Count} Attachments" : "")})";
     }
 }
diff --git a/src/Discord.Net.WebSocket/DiscordSocketClient.cs b/src/Discord.Net.WebSocket/DiscordSocketClient.cs
index be7432bc3..b56498061 100644
--- a/src/Discord.Net.WebSocket/DiscordSocketClient.cs
+++ b/src/Discord.Net.WebSocket/DiscordSocketClient.cs
@@ -1771,17 +1771,7 @@ namespace Discord.WebSocket
             return guild;
         }
         internal SocketGuild RemoveGuild(ulong id)
-        {
-            var guild = State.RemoveGuild(id);
-            if (guild != null)
-            {
-                foreach (var _ in guild.Channels)
-                    State.RemoveChannel(id);
-                foreach (var user in guild.Users)
-                    user.GlobalUser.RemoveRef(this);
-            }
-            return guild;
-        }
+            => State.RemoveGuild(id);
 
         /// <exception cref="InvalidOperationException">Unexpected channel type is created.</exception>
         internal ISocketPrivateChannel AddPrivateChannel(API.Channel model, ClientState state)
diff --git a/src/Discord.Net.WebSocket/Entities/Messages/SocketUserMessage.cs b/src/Discord.Net.WebSocket/Entities/Messages/SocketUserMessage.cs
index b26dfe5fb..e1f0f74dc 100644
--- a/src/Discord.Net.WebSocket/Entities/Messages/SocketUserMessage.cs
+++ b/src/Discord.Net.WebSocket/Entities/Messages/SocketUserMessage.cs
@@ -123,7 +123,7 @@ namespace Discord.WebSocket
                 model.Content = text;
             }
         }
-        
+
         /// <inheritdoc />
         /// <exception cref="InvalidOperationException">Only the author of a message may modify the message.</exception>
         /// <exception cref="ArgumentOutOfRangeException">Message content is too long, length must be less or equal to <see cref="DiscordConfig.MaxMessageSize"/>.</exception>
@@ -147,7 +147,19 @@ namespace Discord.WebSocket
         public string Resolve(TagHandling userHandling = TagHandling.Name, TagHandling channelHandling = TagHandling.Name,
             TagHandling roleHandling = TagHandling.Name, TagHandling everyoneHandling = TagHandling.Ignore, TagHandling emojiHandling = TagHandling.Name)
             => MentionUtils.Resolve(this, 0, userHandling, channelHandling, roleHandling, everyoneHandling, emojiHandling);
-        
+
+        /// <inheritdoc />
+        /// <exception cref="InvalidOperationException">This operation may only be called on a <see cref="SocketNewsChannel"/> channel.</exception>
+        public async Task CrosspostAsync(RequestOptions options = null)
+        {
+            if (!(Channel is SocketNewsChannel))
+            {
+                throw new InvalidOperationException("Publishing (crossposting) is only valid in news channels.");
+            }
+
+            await MessageHelper.CrosspostAsync(this, Discord, options);
+        }
+
         private string DebuggerDisplay => $"{Author}: {Content} ({Id}{(Attachments.Count > 0 ? $", {Attachments.Count} Attachments" : "")})";
         internal new SocketUserMessage Clone() => MemberwiseClone() as SocketUserMessage;
     }
diff --git a/src/Discord.Net.WebSocket/Entities/Users/SocketUser.cs b/src/Discord.Net.WebSocket/Entities/Users/SocketUser.cs
index 09c4165f4..b830ce79c 100644
--- a/src/Discord.Net.WebSocket/Entities/Users/SocketUser.cs
+++ b/src/Discord.Net.WebSocket/Entities/Users/SocketUser.cs
@@ -44,8 +44,11 @@ namespace Discord.WebSocket
         /// <summary>
         ///     Gets mutual guilds shared with this user.
         /// </summary>
+        /// <remarks>
+        ///     This property will only include guilds in the same <see cref="DiscordSocketClient"/>.
+        /// </remarks>
         public IReadOnlyCollection<SocketGuild> MutualGuilds
-            => Discord.Guilds.Where(g => g.Users.Any(u => u.Id == Id)).ToImmutableArray();
+            => Discord.Guilds.Where(g => g.GetUser(Id) != null).ToImmutableArray();
 
         internal SocketUser(DiscordSocketClient discord, ulong id)
             : base(discord, id)
diff --git a/src/Discord.Net.Webhook/DiscordWebhookClient.cs b/src/Discord.Net.Webhook/DiscordWebhookClient.cs
index 9c90df565..353345ded 100644
--- a/src/Discord.Net.Webhook/DiscordWebhookClient.cs
+++ b/src/Discord.Net.Webhook/DiscordWebhookClient.cs
@@ -33,7 +33,7 @@ namespace Discord.Webhook
             : this(webhookUrl, new DiscordRestConfig()) { }
 
         // regex pattern to match webhook urls
-        private static Regex WebhookUrlRegex = new Regex(@"^.*discordapp\.com\/api\/webhooks\/([\d]+)\/([a-z0-9_-]+)$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static Regex WebhookUrlRegex = new Regex(@"^.*(discord|discordapp)\.com\/api\/webhooks\/([\d]+)\/([a-z0-9_-]+)$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
         /// <summary> Creates a new Webhook Discord client. </summary>
         public DiscordWebhookClient(ulong webhookId, string webhookToken, DiscordRestConfig config)
@@ -132,13 +132,13 @@ namespace Discord.Webhook
             if (match != null)
             {
                 // ensure that the first group is a ulong, set the _webhookId
-                // 0th group is always the entire match, so start at index 1
-                if (!(match.Groups[1].Success && ulong.TryParse(match.Groups[1].Value, NumberStyles.None, CultureInfo.InvariantCulture, out webhookId)))
+                // 0th group is always the entire match, and 1 is the domain; so start at index 2
+                if (!(match.Groups[2].Success && ulong.TryParse(match.Groups[2].Value, NumberStyles.None, CultureInfo.InvariantCulture, out webhookId)))
                     throw ex("The webhook Id could not be parsed.");
 
-                if (!match.Groups[2].Success)
+                if (!match.Groups[3].Success)
                     throw ex("The webhook token could not be parsed.");
-                webhookToken = match.Groups[2].Value;
+                webhookToken = match.Groups[3].Value;
             }
             else
                 throw ex();