two times in the code you are downloading that gravatar image, in
views/wp-admin/parts/accounts.php and in
lib/social/service/account.php - why? can't you just put that file in
assets/? use a different icon, if this is a copyright issue. it is used as a dummy at the facebook and twitter section, so it does not even refer to a gravatar functionality.
this is a totally unnecessary http-request to a third party server and therefore violating personal privacy. also, it is forwarded to a non-ssl-site, so it is also a security-issue. this should be eliminated, asap.