There is also an open source project called Silo.pub that provides a micropub endpoint for services like Tumblr, WordPress.com, Blogger, and Twitter (among others). Aaron Parecki has a public version I’m sure he wouldn’t mind if you tried.
Other platforms could quickly allow the functionality and so much more by building their own micropub servers, which would be a major boon to the social media space and the open web.
If you have questions about implementation while building, feel free to pop into the IndieWeb #dev chat (where prior implementers and others) are available for help. (Alternate chat modalities including Slack and IRC are available if you prefer.)