(Edit) see my follow-up post #5: Linking Community/Guild into Macro - #5 by Ketho-boulderfist
You can link guilds or communities into a macro but it’s a bit unintuitive, you need to select the macro editbox first and then click the share link button
Alternatively you can announce the link through the api, e.g. to the trade channel
/run local c=ClubFinderGetCurrentClubListingInfo(C_Club.GetGuildClubId())SendChatMessage("test "..GetClubFinderLink(club.clubFinderGUID, club.name).." message","CHANNEL",nil,2)