Implement a feed stream in Django
I would suggest to create a new model (let's say UserActions) in which you will trace all desired actions by adding an item on each of your others models "save" action. 
Then you can easily build a view for this model and generate a feed with all the actions in chronological order.
I've a Django application that uses a Product model and a Comment model.

A User can add a Product to its favorite products list.
A User can leave a Comment to a Product.

I would implement a news feed in the home of my application, something like Facebook News feed.
Something like this:

user_1 just comments product_3: "this is beautiful!"
user_1 just added product_3 to its list
user_4 just added product_2 to its list
user_4 just added product_3 to its list
user_2 just comments product_1: "recommended!"
user_4 just added product_1
etc.

So it's a feed with various type of sentences.
Have you ideas to implement something like that in a good way?