No worries, Frank. Communities are “messy”! The discourse platform has its design reasons for a flat discussion structure, see for some insight
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I love that you are inviting people to use the OER World Map, I know @SusanneGrimm who is at the conference will be overjoyed.
I might suggest that a slightly better approach than inserting this into the welcome thread, is this is a case where it would work better to create a call to use the OER World Map as a separate new topic/activity in the interaction zone that way the topic stays focused on the map (like the one there for showing your map distance to Cambridge).
Blame me for the mess! And welcome to the conference, we are glad to have OERcampers here.