To field can be added for multiple activities

daemon.py

@@ -1260,15 +1260,10 @@ class PubServer(BaseHTTPRequestHandler):
 
         originalMessageJson = messageJson.copy()
 
-        # For follow activities add a 'to' field, which is a copy
-        # of the object field
-        messageJson, toFieldExists = \
-            addToField('Follow', messageJson, self.server.debug)
-
-        # For like activities add a 'to' field, which is a copy of
-        # the actor within the object field
-        messageJson, toFieldExists = \
-            addToField('Like', messageJson, self.server.debug)
+        addToFieldTypes = ('Follow', 'Like', 'Add', 'Remove')
+        for addToType in addToFieldTypes:
+            messageJson, toFieldExists = \
+                addToField(addToType, messageJson, self.server.debug)
 
         beginSaveTime = time.time()
         # save the json for later queue processing