shared-interests

Amino is a social network where people can join communities for their favorite topics / fandoms and make friends.

Chatous lets you have random chats with real people from all over the world! Meet new people and talk about what matters to you. You can chat with people from all over the world about the topics you care about. You never know who you'll meet!

Pearltrees is a social curation tool. It lets you organize, discover and share the stuff you like on the web.