I have a JSON Feed (http://kingofslugs.com/dancingfools-rss-feed/?x=1) that used to work but in the last few weeks has instead been listed as " Not an RSS feed (553)". However the JSON Feed validator (http://validator.jsonfeed.org/) claims that it’s a valid feed. Can you tell me why newsblur doesn’t think it’s a valid feed anymore?
I checked out the newsblur code and, by reading it, solved this: the problem was that the feed url needed to end in ‘.json’. Don’t know why it worked before and then stopped working, but it’s working again now.