This is new to me at least. When I got home from Spain yesterday I had this in my mailbox:
Dear Ryanair Customer
We are committed to Customer Service and value your feedback and would like to hear your views on your recent Ryanair flight. The link below takes you to our short survey which will take only a couple of minutes to complete.
The details of the flight will automatically display, when you click on the link below.
Please click the link below to complete the survey.
http://www.frsurvey.com/rest_deleted
Thank you for participating in our Customer Service survey.
Ryanair Customer Service
The survey included rating of staff friendlyness, flight experience, reasons for choosing Ryanair etc...