This first script gets the data from my main account and is going to put that data into various files for storage.

Your program flow is interleaved/buried between variable/subroutine declarations and loops.

If I were you, I would make more functions (one for each loop), so that each program boils down to

#!/usr/bin/perl --
use strict;
use warnings;
...
Main( @ARGV );
exit( 0 );
sub Main {
   my $blah = Function1();
   my @blah = Function2($blah);
   @blah = Function3( \@blah );
   ...
}
[download]

And of course, use meaningful function names

Do I send a message to all the lists followers individually? Do I announce the move from my main account to all my followers?

Ask yourself:

Do I really want my followers to follow?

Are my followers twitter-savvy technically inclined individuals?

If the answer is yes, do both, and make it easy for them to follow you on the correct, new list (or whatever twitter boom bah)

My head is a bit fuzzy from all of this cargo culting. I probably have way too much code here for the task.

The code (the how) is distracting your from the why -- don't look at the code, don't think in terms of code/API calls, try thinking in terms of joe-twitter-user / joe-twitter-follower