Hackers' Pub is an ActivityPub-enabled social network for hackers. You can think of it as a federated version of DEV Community with a Mastodon-like timeline.
South Korea
Wafrn Alternatives
Wafrn is described as 'Social network inspired by tumblr, that also can connect with other wafrn instances, or with mastodon, pleroma, firefish and other platforms that use activitypub' and is a Social Network in the social & communications category. There are more than 10 alternatives to Wafrn for a variety of platforms, including Web-based, Android, iPhone, Android Tablet and iPad apps. The best Wafrn alternative is Mastodon, which is both free and Open Source. Other great apps like Wafrn are Pixelfed, Tumblr, Blogger and Medium.