Thanks for the mention - I started ETM with a similar goal in mind. We have a "personalize this recipe" function that's functionally similar to forking, but we never expanded on it much. We're planning to improve the social and browsing features eventually, but have some other priorities to get to first.
I forgot about ETM! Thanks for creating it. Just logged back in and there was a friendly note about the new features (really good idea!). FYI there's one bug on the page:
Also, cinc looks really nice - awesome work OP