How to remove your LiveJournal account
The sentence we don’t like about the FAQuestion on removal is: “However, you will need to manually delete any comments or entries you posted in other journals/communities.” That may be a lot of work!
This means a completely automated removal is impossible. Anyway… Be logged in, use the link to delete and deactivate your journal (account). You have 30 days to undelete your account. Also read http://www.livejournal.com/support/faqbrowse.bml?faqid=16
Direct removal link: http://www.livejournal.com/accountstatus.bml
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for LiveJournal using a third-party login such as Facebook or Twitter, you probably want to revoke all access from LiveJournal. Click here to find out how.