<p><a href="https://stats.meta.stackexchange.com/ads/display/5551">https://stats.meta.stackexchange.com/ads/display/5551</a> it seems to be already active, it just gets no clicks. </p>

<p>Well.... one now, since I just clicked on it. Now it says 0.07 clicks per day. So that means it was online 14 or 15 days ago (today is May 2th). That is about 1 or 2 days after you posted the add.</p>

<p>Beyond that, I have no idea if, how often and where those ads are shown. I have never seen them.</p>
