BukMarks! allows you to post bookmarks with del.icio.us , Google BUZZ, diggo ,twitter and eventually it would allow you to post bookmarks, sync and backup all your bookmarks on any of the Web based social network that the user desires . It would sync/backup all your bookmarks to Ubuntu one . It would also have an iPhone/Android client which would allow you to post bookmarks from those devices too. If possible it would also allow users to get links or URLs from Stumbleupon .