On your favorites list you can add members that you are interested in, this makes it easy to find them again. See all of the members you previously marked as interesting under Favorites (star icon, top right) . You can easily add members to this list while searching. You can also add someone to your Favorites list by going to their profile and clicking 'Save to Favorites'.
Fans are members who have added you to their favorite-list. Fans can only be viewed by paid members. Want to view your fans? Upgrade. You can view your Fans by going on your Favorites-list and clicking Fans.
Visitors / Who's Viewed Me
Here you will see the latest members that checked your profile out. How to get more profile views? Read this article