Regarding the request:
When I click on the soccer players example in the Apply section, I now get a popup:
“DBpedia says: Cross-site requests prohibited. You will only be able to SPARQL the origin site: ReferenceError: netscape is not defined”
Regarding the “don’t criticise message”:
There was a note that it appears for the two first posts for every new user. So I can’t see it any more and am afraid I cannot quote the exact message. I think I remember the words “constructive” and “criticise ideas, not people”.
It didn’t feel super inviting, but maybe it’s working since you mentioned that your discussion culture is very healthy.