I'm the founder of https://kontxt.io which is an integrative micro blogging platform that clones websites and converts PDFs (and most other documents since they can be converted to PDFs) to websites that's enhanced with real-time collaboration including highlights, comments, polls, @mentons, speedy navigation, etc. It lets you save, share, and respond to articles in context.

The collaborative technology can also easily be added to any website or blog, too!

I'll soon be adding search, a public feed like Twitter for discovery, and a way to extract and use highlights across articles. Check it out and let me know what you think.