Create a post with wiki links, images, or template invocations.
Go to the page, image, or template, click What links here.
Result: there's nothing there for the Flow topic. quiddity reports that the link did show up when someone replies to the post. spage reproduced with http://ee-flow.wmflabs.org/wiki/Topic:Ryxt0opbv79ld37k ; there were no entries for any of the items 15 minutes after creating the post. We're not sure what the delay is.