It is great, you can filter who you add, who can respond to you and who can view you. It also has communitys for you to seek others of like minds. For Example our community is Dallas BDSM.
Live Journal is a good one, as others have mentioned. It's gothic spoof of a cusin, Dead Journal can appeal to some. Caledia's another good one. If you want a blog-style journal, Blogger might be the ticket.
In any case, good luck finding something that works for you. If you have close friends that maintain journals you also view, I'd recommend considering using their same service.
i write on a blog on yahoo.....it is private and i have been amazed when i read something i wrote months ago.....i love it when i can make me go hmmmmmmm