Logged in users can see recommended debates or proposals by sorting them by "recommendations".
The sorted list shows, ordered by votes in descending order, those elements that:
Have tags that interest the user. Those tags are the ones on the proposals that the user follows.
The user isn't the author.
In the case of proposals: only those that haven't reached the required threshold of votes and the user isn't already following.
How to try this feature
In our local installation, if we haven't logged in, we can check at http://localhost:3000/proposals that the "recommendations" sorting option isn't present:
The sorting options don't include "recommendations"