Oh wait it's been done! :) You go on your profile, so "your stuff", and then on the bottom right you will see a list of your followers in the order of who were on most recently.
I don't think you can do that at the moment, not of the people you are following at least. I hope they bring that back.
You can click on the 'People' tab at the top of the page. That will tell you who has recently been on the site.
Thanks Miss Janice and Yummeh.