Trivia: I tried this today and it told me the feed did not exist, walked me through the setup, and then added me to the feed which did, in fact, already exist. So it worked, but didn't do exactly what it said on the tin.
My guess is that it was a feed that had been duplicated because there were two links that could have been used to make the feed. So, one was folded into the other and now, when you try to make a feed with the non-dominant feed link, it knows to add you to the dominant feed but the steps to make that happen aren't quite sorted out yet. The combining of feeds just happened recently.
If you look under the "Read" tab of the site navigation bar, you'll find Feeds. On that page, you can add the URL of the site feed that you're interested in, and it will automatically check against the existing list of feeds to see if the feed already exists.
When you put in the feed URL, it'll tell you if someone's already created a feed for that URL -- though you can still end up with duplicates when a blog (or whatever) has feeds in multiple formats.
If you have a good idea what title someone would have given it, you can type it in directly to see if it exists; all Dreamwidth feeds come in the format http://title-feed.dreamwidth.org/ , e.g. xkcd_feed.
You could also check the grand list of the 1000 most popular feeds (which currently goes down to feeds with only two subscribers, so it's probably still pretty comprehensive):
I used to really enjoy Fugly Horse of the Day, but then she got really into hating on fat people. I don't know if she still does it, but it's why I stopped reading.
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If you have a good idea what title someone would have given it, you can type it in directly to see if it exists; all Dreamwidth feeds come in the format http://title-feed.dreamwidth.org/ , e.g.
You could also check the grand list of the 1000 most popular feeds (which currently goes down to feeds with only two subscribers, so it's probably still pretty comprehensive):
http://www.dreamwidth.org/feeds/list
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Bad Money Advice
Occasional Manatee
The Hooded Utilitarian
lacquerized. - a blog about nail polish
Fugly Horse of the Day
So much for getting any work done today.
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Does anyone know what the policy is for duplicate feeds? Can they be combined?
http://zenhabitsnet-feed.dreamwidth.org/
http://zenhabits-feed.dreamwidth.org/
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