For long articles, or content I really want to digest, I copy the text into a text file in a directory in my home space (with original URL and under git control). When I get to it, I delete the lines I've read, or add notes to follow up with more research or comments. This is all under automated git commits, so I can track my reading backlog at any point in time, and can go back to an article 6 months ago that I may have "deleted" simply by searching my automated commits.
