my %hash = (
  response => {
    blogs    => [
      {
        url     => 'equipo.tumblr.com',
        name    => 'equipo',
        updated => 1346015230,
      },
      {
        url     => 'linux.tumblr.com',
        name    => 'linuxmint',
        updated => 1345967468,
      },
    ],
  },
);
my @urls = map { $_->{url} } @{$hash{response}{blogs}};