When I reply to people's questions on SDs, I usually share links of older posts that contain detailed information of what they've asked. So, if we share links from Duome forum on Duolingo's SDs, then people could find about it. For example, if someone asks how an indirect question is formed in English, one could answer to them and, at the end of their post, tell them that there's a similar discussion on Duome with examples.
Obviously, the links should be relevant to the question asked and not random sharing/promoting of Duome forum.