Yes, it's the First Post in this journal.

All those Anonymous Cowards trying to make a First Post again after every story obviously have not yet found out about this foolproof way to get a First Post: As soon as you create an account on slashdot, you get a journal, and in your journal you always will have the first post.

So don't be an Anonymous Coward, get an account, and you get your guaranteed First Post for free!