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I have just introduced Open Submitter, (https://github.com/BackSpaceTech/open-submitter) a no cost and open source application for spinning and submitting articles to services (Wordpress, Tumblr etc).
I have developed a handful of service scripts for doing this currently but have produced it to start with using Wordpress to help reduce any support problems with the first release.
I am researching which services to develop submit scripts for but unfortunately the listing is big. Can you please provide me advice as to what are the well-known and essential services to code scripts for by priority?

why in js? there are so many limitations/issues, besides such applications need multithreads for proper performance, but i guess its a nice hobby project.
the code is very simplistic, so good for beginners to learn. nothing for "real-world" backlink campaigns though IMHO :)
anyways good luck with your project!