diff --git a/demos/auth/authdemo.py b/demos/auth/authdemo.py
index 3e666c88..9585ff1a 100755
--- a/demos/auth/authdemo.py
+++ b/demos/auth/authdemo.py
@@ -42,7 +42,7 @@ class Application(tornado.web.Application):
 
 class BaseHandler(tornado.web.RequestHandler):
     def get_current_user(self):
-        user_json = self.get_secure_cookie("user")
+        user_json = self.get_secure_cookie("authdemo_user")
         if not user_json: return None
         return tornado.escape.json_decode(user_json)
 
@@ -66,7 +66,7 @@ class AuthHandler(BaseHandler, tornado.auth.GoogleMixin):
     def _on_auth(self, user):
         if not user:
             raise tornado.web.HTTPError(500, "Google auth failed")
-        self.set_secure_cookie("user", tornado.escape.json_encode(user))
+        self.set_secure_cookie("authdemo_user", tornado.escape.json_encode(user))
         self.redirect("/")
 
 
@@ -77,7 +77,7 @@ class LogoutHandler(BaseHandler):
         # returning to this app will log them back in immediately with no
         # interaction (unless they have separately logged out of Google in
         # the meantime).
-        self.clear_cookie("user")
+        self.clear_cookie("authdemo_user")
         self.write('You are now logged out. '
                    'Click <a href="/">here</a> to log back in.')
 
diff --git a/demos/blog/blog.py b/demos/blog/blog.py
index f6487bcf..b5317822 100755
--- a/demos/blog/blog.py
+++ b/demos/blog/blog.py
@@ -69,7 +69,7 @@ class BaseHandler(tornado.web.RequestHandler):
         return self.application.db
 
     def get_current_user(self):
-        user_id = self.get_secure_cookie("user")
+        user_id = self.get_secure_cookie("blogdemo_user")
         if not user_id: return None
         return self.db.get("SELECT * FROM authors WHERE id = %s", int(user_id))
 
@@ -170,13 +170,13 @@ class AuthLoginHandler(BaseHandler, tornado.auth.GoogleMixin):
                 return
         else:
             author_id = author["id"]
-        self.set_secure_cookie("user", str(author_id))
+        self.set_secure_cookie("blogdemo_user", str(author_id))
         self.redirect(self.get_argument("next", "/"))
 
 
 class AuthLogoutHandler(BaseHandler):
     def get(self):
-        self.clear_cookie("user")
+        self.clear_cookie("blogdemo_user")
         self.redirect(self.get_argument("next", "/"))
 
 
diff --git a/demos/chat/chatdemo.py b/demos/chat/chatdemo.py
index 82aafd65..6c3fcac2 100755
--- a/demos/chat/chatdemo.py
+++ b/demos/chat/chatdemo.py
@@ -50,7 +50,7 @@ class Application(tornado.web.Application):
 
 class BaseHandler(tornado.web.RequestHandler):
     def get_current_user(self):
-        user_json = self.get_secure_cookie("user")
+        user_json = self.get_secure_cookie("chatdemo_user")
         if not user_json: return None
         return tornado.escape.json_decode(user_json)
 
@@ -142,13 +142,13 @@ class AuthLoginHandler(BaseHandler, tornado.auth.GoogleMixin):
     def _on_auth(self, user):
         if not user:
             raise tornado.web.HTTPError(500, "Google auth failed")
-        self.set_secure_cookie("user", tornado.escape.json_encode(user))
+        self.set_secure_cookie("chatdemo_user", tornado.escape.json_encode(user))
         self.redirect("/")
 
 
 class AuthLogoutHandler(BaseHandler):
     def get(self):
-        self.clear_cookie("user")
+        self.clear_cookie("chatdemo_user")
         self.write("You are now logged out")
 
 
diff --git a/demos/facebook/facebook.py b/demos/facebook/facebook.py
index 341384c0..e252e298 100755
--- a/demos/facebook/facebook.py
+++ b/demos/facebook/facebook.py
@@ -55,7 +55,7 @@ class Application(tornado.web.Application):
 
 class BaseHandler(tornado.web.RequestHandler):
     def get_current_user(self):
-        user_json = self.get_secure_cookie("user")
+        user_json = self.get_secure_cookie("fbdemo_user")
         if not user_json: return None
         return tornado.escape.json_decode(user_json)
 
@@ -92,17 +92,17 @@ class AuthLoginHandler(BaseHandler, tornado.auth.FacebookGraphMixin):
         self.authorize_redirect(redirect_uri=my_url,
                                 client_id=self.settings["facebook_api_key"],
                                 extra_params={"scope": "read_stream"})
-    
+
     def _on_auth(self, user):
         if not user:
             raise tornado.web.HTTPError(500, "Facebook auth failed")
-        self.set_secure_cookie("user", tornado.escape.json_encode(user))
+        self.set_secure_cookie("fbdemo_user", tornado.escape.json_encode(user))
         self.redirect(self.get_argument("next", "/"))
 
 
 class AuthLogoutHandler(BaseHandler, tornado.auth.FacebookGraphMixin):
     def get(self):
-        self.clear_cookie("user")
+        self.clear_cookie("fbdemo_user")
         self.redirect(self.get_argument("next", "/"))