th.omas giveth what flickr taketh away.
About 20 months ago, when Flickr rolled out their new “contacts” pages, they crippled a key part of the software that had been requested by many users — the ability to see who your non-reciprocating contacts were. At present Flickr will show you who calls you a contact. And they will show you who you call a contact. And they will show you who calls you a contact that you don’t back.
But they won’t let you see who *you* call a contact but who does *not* call you one back (or maybe who *used* to call you a contact but who has since dropped you when you weren’t looking).
Apparently the ability to view non-reciprocal contacts was built into the beta version of Flickr’s contact screens, but was removed when Flickr staff felt that it caused too much “drama.”
From Flickr Staffer Dunstan Orchard:
th.omas: “A missing feature I’d like to see is a list of all my contacts who do not call me one of their own…”
That was in the original build, but in beta testing threw up all kinds of “I CANNOT believe you don’t have me marked as a FRIEND!!” drama. It was quite amazing.
After a while we all agreed it was a feature that did more harm than good, so it got the chop.
(As a minimum we try to have new features on Flickr not cause actual crying and yelling. I think that’s an acceptable baseline to work from.)
Well if you want this data from your contacts screen there is now an easy way to get it. Just install th.omas’ alpha version of the Flickr Non-Reciprocal Contacts Finder greasemonkey script. You can get the script here.
The script didn’t work for me on Chrome when I tested it out. But it seemed to work flawlessly using Firefox. Basically it takes your current contacts screens and turns anyone who is not reciprocating red.
Why is this important you might ask? Well one reason why is that Flickr currently limits you to 3,000 non-reciprocating contacts. After this you can no longer add any more. So if you’ve reached that limit (or want to manage staying under it) it may be helpful to be able to easily review and identify who these people are that flickr is currently hiding from you to protect you from the “drama” and all.
Or you just may want to know which of your so called friends really love you and which ones secretly hate you or your photography. 
Anyways it’s nice to see a work around out that gets around Flickr’s limitation here. Beware though. They always could kill the ability for this script to work. So if you want to go through your contacts and identify which are non-reciprocal ones, you might want to do it sooner rather than later.
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Thomas Hawk Digital Connection