FriendProject is a retro-inspired social network where you can meet new people, design custom profiles, and connect in a creative, private online space.
Lemmy is a selfhosted, federated social link aggregation and discussion forum. It consists of many different communities which are focused on different topics. Users can post text, links or images and discuss it with others.
Tildes.net is a non-profit, open-source, text-focused community website and a Reddit alternative.
SpaceHey is a retro social network focused on privacy and customizability. It's a friendly place to have fun, meet friends, and be creative.