There was an account with blogger [0]. So they blocked the ip address of that domain which was shared with many others as you can see in this article.

[0] http://translate.google.com/translate?js=n&prev=_t&h...

There were 2 blogs they wanted to block specifically. They blocked those blogs IP addresses without understanding how the internet works.

What were the topics of those two blogs?

Government corruption, etc: http://twitter.com/#!/leakymails , http://www.facebook.com/leakymails

Leakymails.com posted e-mails from goverment officials (the idiots used services like hotmail for work-related communications).

Search for "cuidad.com.ar" + leakymails on google

Leakymails is just an operation to make it look like they have genuine e-mails, but they're fake.

The government jumped the gun when blocking those sites, but that's another issue..