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my $followers = $data->{followersperdate}; ## just copy the reference 
+to the interesting part of the hash

** OR **

my %followers = %{ $data->{followersperdate} }; ## dereference the int
+eresting bit

my @sorted_keys = 
  sort 
...
      <=> 
    $data->{ followersperdate }->{ $a } } ## hi to lo on values
      keys %{ $data->{ followersperdate } }; ## again dereferencing as
+ above