Does anyone know Justin Bieber's tumblr?

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I've seen people on my Twitter who apparently know his tumblr, I don't even know if it's true that he has it or not.
But anyway, I asked this person who tweeted something about his tumblr and said she couldn't give me the link because apparently Justin didn't want people spreading his URL. I find this a bit weird, because,
1. He's extremely famous, if he decides to make a tumblr then obviously he can't expect to hide it for too long, and what's the point in him having one if people don't look at it?
2. If he doesn't want his tumblr URL being spread around, then how the heck do some people know it?
If anyone's got it, then I'd be grateful if you'd tell me so I could have a look! Or just message it to me if you didn't want it being spread around and shizz.