The #occupy protests in the US

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We here in Europe have some trouble figuring out what is going on with the #occupy protests in the US. What exactly is going on where, if anything? When there are protests in Iran, we hear so much about it, but now, it sometimes sounds as if hundreds of people are being arrested in these protests, but it is hard to find information about it, so does that mean that not much is going on, or is there a media blackout? And if such protests are going on, who are the protester and what do they want, what do they think they will accomplish? Is it just angry people who thought they could borrow and borrow and borrow on their credit cards and now are unhappy because they are in debt and are blaming their debts on the banks and big corporations? Is it people who have lost their homes because of mortgages banks should never have sold to them? I'd like to hear, please, so thanks in advance.