How to Tell if a LiveJournal User Is Blocking You
- 1). Log in to your LiveJournal account.
- 2). Navigate to the journal of the user you suspect of blocking you.
- 3). Click on the "Leave a comment" link underneath any of the user's journal entries.
- 4). Scroll down to the comment form located at the bottom of the entry page. If the user has blocked you, a message stating "you have been banned from commenting in this journal" will appear at the top of the comment form next to your user name.
Source...