In the new version of Diigo, you can now delete your account automatically! Just visit the link below and follow the instructions. Good work from the Diigo team for making this possible.
URLS:
http://www.diigo.com
https://secure.diigo.com/setting
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.