You are not logged in. However you can subscribe from another Fediverse account, for example Lemmy or Mastodon. To do this, paste the following into the search field of your instance: !foss@beehaw.org
If it’s free and open source and it’s also software, it can be discussed here. Subcommunity of Technology.
Yes an app, has been available for years: https://apps.nextcloud.com/apps/social
This is kind of misleading since nazi fucks can easly reblog your posts. 🤷🏻♀️