The app (and the website) have a direct link to a Twitter account that is abandoned (the website also have a link to a Facebook profile which is the same).
On the app, maybe replace it with a link to the Updates page of the website, or the blog, since that’s the most up to date place to get news it seems?
On the website, maybe replace them with a link to the YouTube as there is good content there?
Additionally, if you want to start again spreading updates on social media, maybe creating an account on https://typo.social could be nice? That’s where type enthusiasts and type designers are, and the account there can be followed by people across many other socials thanks to it being connected to the “fediverse”.