PSA:

If you need to ban somebody from your journal, go here:
http://www.livejournal.com/admin/console/
and type in the following:
ban_set username
substitute the name of the account for username.

Said person will be unable to comment in your journal and, just as importantly, you will not show up as a Friend Of whosiwhatsis.

(A friend of mine is having a problem with a copycat; I have pre-emptively banned the copycat account)

We now return you to your regularly scheduled LJ.