>>5759020 (pb)
publisher
http://www.businessdictionary.com/definition/publisher.html
>Individual or corporation responsible for the printing and distribution of digital or printed publications. Publishers also handle the marketing efforts for the publications and usually are not the creator of the material. Publishers simply serve as the intermediary between the author of the publication and the consumer market.
platform
https://www.merriam-webster.com/dictionary/platform
3b : a place or opportunity for public discussion
Highlighting the differences