Nice idea. :-)
When I ran the program I noticed that some users were missing from the list. This is due to the regex that extracts the usernames. This is a bit better:
# Don't strip the tags
#$html =~ s/<.*?>//gs ;
my (@users) = $html =~ /<td>by\s[^>]+>([^<]+)/gs ;
# Or this if there are Perlmonks with "<" in their username
my (@users) = $html =~ m[<td>by\s[^>]+>(.*?)</a>]gs ;
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