update：May 11, 2020

An article as a research results from the project “Organizational Efforts to Prevent Harmful Online Communication: A cross-national analysis of online platform providers' policies” (Sabine Einwiller, D16-R-0433) has been published in the journal Policy & Internet.

Here the link to the article.
https://onlinelibrary.wiley.com/doi/epdf/10.1002/poi3.239