Certainly, and thank you for asking! The graphic button is intended to go in place of the text link in my posts. So far my link has read "If you like this article then click here to read more about the subject.(Keywords: this and that)". This link goes in my reply to other people's articles, and it will help readers find related content on steemit. But I've been hoping to replace it with a clickable link-button to take up less space and be as unobtrusive as possible.
The audience will be anyone who reads to the bottom of an article that I reply to. So far I've been indiscriminate about who's articles I reply to, however recently we've implemented a way to opt-out from my replies, either permanently or per-article, with a simple hashtag (#NoRobo).
We're working on setting up an opt-in system so people can tell me to put the related-content link into their pages going farther back (normally I only reply to new articles), but the opt-in feature isn't ready yet.
So technically, anyone on steemit could see this clickable banner link.
Even though nobody has used the #NoRobo hashtag yet, we've started a short list of steemians who've expressed disinterest in my service, the link will not go onto their articles, but they might still see it on other peoples articles.