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The favorites/bookmarking part is something we'll implement soon enough. It is actually based on their RSS streams but in the next update we'll add sources that required web scraping and did not have their own personal feeds.

The short summaries come from using the Embed.ly API for now but we'll replace it just by scraping the Open Graph or Twitter card meta tags from the pages directly.

To keep it reliable and clean we decided not to allow users to add their own sources but we'll keep adding new ones regularly and we'll add a form to take suggestions.