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foreach my $category (sort { ($list->{$_}->{cat_name} cmp $list->{$_}-
+>{cat_name}) } keys %$list) {
  say $list->{$category}{cat_name};
}

Use of uninitialized value $_ in hash element at ./facebook.pl line 34
+.
Use of uninitialized value $_ in hash element at ./facebook.pl line 34
+.
Use of uninitialized value in string comparison (cmp) at ./facebook.pl
+ line 34.
Use of uninitialized value in string comparison (cmp) at ./facebook.pl
+ line 34.

$list = 
{
...
                             },

};