Our Bioacoustics SE site has reached the beta stage. This multidisciplinary site encompasses many disciplines, and there are potential overlaps with other general SE sites.
I posted an "ad" in the meta sites of a couple of related SE sites during the Private Beta stage (see posts in Physics, Sound Design, Biology, Signal processing, and Engineering), and more recently since we've reached the Public Beta (Pets).
While these ad posts are not directly about the site where I posted, the goal is to advertise about the Bioacoustics site to sites which share similar interests so that they know it exists in case they have specific questions that would be more appropriate in our site than in theirs. And let's be honest, also to make our site known better and get more members.
In general, it has been well accepted (up-votes), but some people are reluctant. Is this a good practice to advertise the Beta sites? If not, what would be the process to do so? Is there any policy about this?