Include posters in Twitter notifications

* Also cleanup Facebook

lib/twitter/error.py

@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+
+
+class TwitterError(Exception):
+    """Base class for Twitter errors"""
+
+    @property
+    def message(self):
+        '''Returns the first argument used to construct this error.'''
+        return self.args[0]