(This feature is currently in beta; details are subject to change.)
Buttondown monitors social media for mentions of your newsletter. When we find someone mentioning your newsletter, we'll send you an email notification (that you can opt out of, of course) and include a link to the post in your dashboard.
This lets you know when people are talking about your newsletter online, without you having to go trawling social media yourself. Additionally, you'll be able to view trends and analytics to get a better understanding of how your newsletter is doing on social media.