You can easily see who you follow and who follows you. These contact lists are accessible from any page where your profile header appears on web, like your Photostream, About, or Albums pages.
Follow/ unfollow a member
Follow a member
Unfollow a member
Select the Flickr member's name to view their profile.
Select Follow to add them to your contacts.
Select the Flickr member's name to view their profile.
Hover over Following.
Select Unfollow to remove them from your contacts.
OR
From the feed, tap the three-dot menu on their post.