In the preceding chapter, you implemented AJAX views into your project using jQuery and built a JavaScript bookmarklet to share content from other websites on your platform.

In this chapter, you will learn how to build a follower system and create a user activity stream. You will discover how Django signals work and integrate Redis's fast I/O storage into your project to store item views.

This chapter will cover the following points:

• Creating many-to-many relationships with an intermediary model
• Building a follower system
• Creating an activity stream application
• Adding generic relations to models
• Optimizing QuerySets for related objects
• Using signals for denormalizing counts
• Storing item views in Redis