One common feature request we've had for Pinax is the ability for users to indicate that they "Like" some object. So, we wrote an app called phileo and open sourced it under a BSD license for use in Pinax and Django projects in general.

There are times when you have a publicly available site, so you don't need invites to join a private site. However, you would like to encourage users to tell people about your site and reward them for doing so. This is where anafero comes in as a referral app.

It's a fairly common feature these days for sites to permit users to invite others to join the site. This is even more popular in closed, private beta sites that haven't launched yet where it is desirable for the user base to grow in an organic but controlled fashion.

One of the core features of Pinax is the inclusion of various starter projects. There are three very different types of starter project, though, and knowing the distinction is important to understanding how best to use them.