This was a big problem for me on various forums. I don't want one aggregator to control this on all sites I use either. I ended up keeping per-site folders with text copies of the good stuff with links back to originals. Each site letting one organize the material is a step up. API's that make that easy to automate might be next step up from there. Then, what goes into each site can be locally generated, customized for each per their style, and uploaded.
I don't want one aggregator to control this on all sites I use either.
Definitely! This was partly the motivation for starting the site. Your bookmarks are yours, and it's important to us to avoid siloing data. The API might end up similar to https://github.com/HackerNews/API.