Hi Werner,
I believe that Marko is managing the Slack Channel. When it was first set up, I was unaware of what Slack was and when it was explained to me, I felt that it did not reflect my working habits. So I have stayed away. For communication with the seriousplaypro community, I use this WordPress-based site. For bi-lateral asynchronous communications, I use email. For bi-lateral synchronous communications, I use phone and Skype. Many people have tried to convince me to use WhatsApp, but I can’t see any advantages, just disadvantages, particularly as it is device dependent (WhatsApp web still requires your original device for authentication) and when you have multiple phone numbers on multiple devices, things start to get challenging. In Outlook on my PC, I can manage multiple email addresses in one place, WhatsApp web doesn’t allow this. As for Slack Channel, as I have never used it, I cannot comment on its strengths or weaknesses and cannot tell you to what extent SeriousPlayPro members are using it.
Sorry not to have been able to be more helpful.
Kind regards,
Eli