Curius - Collaborative bookmarker and highlighting tool

From their Chrome Extension page:

Learn together
Collaborative bookmarker and highlighting tool that helps you discover what your friends are reading. Click on the extension icon to save the link, then make selections anywhere on the page to highlight and add annotations. You can comment on snippets and tag your friends in the article.

Web page here: https://curius.app/
Chrome extension here: Curius - Chrome Web Store

I find this app very intuitive with a clean design and with a solid feature set.

Looks very interesting. Thanks.