wp_authenticate
Action Hook: Fires before the user is authenticated.
Source: wp-includes/user.php:78
get_user_count()
Function: Returns the number of active users in your installation.
Source: wp-includes/user.php:1367
pre_user_login
Filter Hook: Filters a username after it has been sanitized.
Source: wp-includes/user.php:2134
make_spam_user
Action Hook: Fires after the user is marked as a SPAM user.
Source: wp-includes/user.php:2493
make_ham_user
Action Hook: Fires after the user is marked as a HAM user. Opposite of SPAM.
Source: wp-includes/user.php:2502