Conditional For get_the_author_meta

get_the_author_meta() returns the data for use in PHP. To display the
information instead, use the_author_meta()

http://codex.wordpress.org/Function_Reference/get_the_author_meta

Your code does not echo data even if it is present. Add an echo or use the_author_meta

<?php if(get_the_author_meta('twitter') ): ?>
  <a href="https://www.twitter.com/<?php echo get_the_author_meta('twitter'); ?>" target="_blank">Twitter</a></p>
<?php else: ?>
  <strong>No website</strong>
<?php endif; ?>


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