Why do you need to be "invited" to Pinterest?

My friend told me about it and it sounds cool so I went to go sign up. I had to apply for an invite. I got this e-mail: Hi! Thanks for joining the Pinterest waiting list. We'll be sure to send you an invite soon. In the meantime, you can follow us on Twitter. You can also explore a few pins. We're excited to get you pinning soon! - Ben and the Pinterest Team What is that? Why can't I just sign up and join and start making my own sets?

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People are getting e-mails from be that I did not send...how can I stop this?

I think my e-mail has been hacked. How can I stop it from happening?

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How do you hack or trick Norton security?

My parents gave me there old computer but it has Norton security safety minder.Any site I go on it pops up saying it is unnamed or something. My parents have forgotten there password. Is there any way I can get in with just the e-mail address or even without. I don't know much about computers

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