For some reason, whenever I have a user use Twitter as his option for an avatar, the image shows up blurry. The image is 48px and is being stretched to 100px (which is what I have it set to). Here is the code I am using:
<?php echo get_avatar( get_the_author_meta( 'user_email' ), 100 ); ?>
I tried using the code you suggested on the Avatars setting page but I didn't have any luck.