I'm seeing people saying accounts are being deleted with no warning, but I have no idea if that's true or not. I've also seen several people posting warnings along the lines of 'post in your accounts or LJ may delete your account.' I don't think that's the case...if you're in danger of being deleted, you should be receiving notification.

I have two other LJ accounts - one of which has not been active since 2003, while the other is updated very infrequently - and neither have been flagged for deletion.