konradc ...
I expect to pass through this world but once. Any good, therefore, that I can do or any kindness I can show to any fellow creature, let me do it now. Let me not defer or neglect it for I shall not pass this way again. — Stephen Grellet, 1773-1855
> I see that we can import from some social bookmarking sites, but not Stumbleupon. Will this option be provided in the future? Thanks.
Try this method ...
Save your SU thumbs ups to the local bookmarks ...
1. From the SU Firefox toolbar > Toolbar Options
2. Search & Tagging tab
3. Put a check on "Save favorites & tags to a Firefox bookmark folder"
4. Click "Download Favorites"
This could take a while depending on how many thumbs up you have.
When completed, import into Diigo ...
1. From the Diigo Firefox toolbar
2. Click on the Diigo icon > Import My Bookmarks ...
3. Click Import All
4. This will import everything from your local bookmarks
This is the quick & dirty way of importing everything but you might want to import them as private first and clean up and release to the public as you go.