diff --git a/mitterlib/network/__init__.py b/mitterlib/network/__init__.py
index 1361395..6e6766a 100644
--- a/mitterlib/network/__init__.py
+++ b/mitterlib/network/__init__.py
@@ -263,11 +263,11 @@ class Networks(object):
         self._save()
         return
 
-    def favourite(self, message):
-        """Change the favourite status of the message."""
+    def favouite(self, message):
+        """Change the favorite status of the message."""
         assert(isinstance(message, NetworkData))
         self._proxy()
-        self.networks[message.network].favourite(message)
+        self.networks[message.network].favorite(message)
         self._operations += 1
         self._save()
         return
@@ -319,4 +319,4 @@ class Networks(object):
         for shortcut in self._targets(network):
             requests = self.networks[shortcut].available_requests()
             result[shortcut] = requests
-        return result
\ No newline at end of file
+        return result
diff --git a/mitterlib/network/networkbase.py b/mitterlib/network/networkbase.py
index b772c0c..e314303 100644
--- a/mitterlib/network/networkbase.py
+++ b/mitterlib/network/networkbase.py
@@ -139,8 +139,8 @@ class NetworkData(object):
         """Message timestamp (as a datetime object). Defaults to None.
         *Optional*"""
 
-        self.favourite = False
-        """Boolean indicating if the message was marked as "favourite" or not.
+        self.favorite = False
+        """Boolean indicating if the message was marked as "favorite" or not.
         *Optional*"""
 
         self.parent = None
@@ -268,8 +268,8 @@ class NetworkBase(object):
         # anyway?
         return None
 
-    def favourite(self, message):
-        """Toggle the favourite status of a message. *message* must be a valid
+    def favorite(self, message):
+        """Toggle the favorite status of a message. *message* must be a valid
         :class:`NetworkData` object. Returns True if the request was
         successful or False otherwise."""
         # TODO: Again, if errors appear as exceptions, why return something?
@@ -301,4 +301,4 @@ class NetworkBase(object):
         """Return the number of requests the user can request before being
         capped. If such limitation doesn't exist for the network, a negative
         number should be returned."""
-        return -1
\ No newline at end of file
+        return -1
diff --git a/mitterlib/network/twitter.py b/mitterlib/network/twitter.py
index 2e7e7a3..d8f031f 100644
--- a/mitterlib/network/twitter.py
+++ b/mitterlib/network/twitter.py
@@ -144,7 +144,7 @@ class TwitterNetworkData(NetworkData):
             self.protected = data['user']['protected']
 
         if 'favorited' in data:
-            self.favourited = data['favorited']
+            self.favorited = data['favorited']
 
         if 'in_reply_to_status_id' in data and data['in_reply_to_status_id']:
             owner = NetworkUser()
@@ -495,11 +495,11 @@ class Connection(NetworkBase):
         data = self._request(resource, body=body)
         return TwitterNetworkData(data, self.user.username)
 
-    def favourite(self, message):
-        """Mark a message as favourite."""
+    def favorite(self, message):
+        """Mark a message as favorite."""
         assert(isinstance(message, NetworkData))
         body = urllib.urlencode({'id': message.id})
-        if not message.favourite:
+        if not message.favorite:
             resource = '/favorites/create/%d.json' % (message.id)
         else:
             resource = '/favorites/destroy/%d.json' % (message.id)