This is a useful discussion of webmentions from David Shanske and Chris Aldrich. It will be interesting to see the impact of GDPR on the #IndieWeb and the web as a whole. I still wonder the next step in regards to webmentions, such as Gen 3 and 4. Is the challenge in regards to the platforms? For example, does WordPress only allow a certain amount of support? I know that Edublogs closes a number of APIs, I am guessing this is probably related.