WordPress at a glance
filter is not described

get_avatar_comment_types filter-hook . WP 3.0.0

Filters the list of allowed comment types for retrieving avatars.

Usage

add_filter( 'get_avatar_comment_types', 'filter_function_name_7550' );
function filter_function_name_7550( $types ){
	// filter...

	return $types;
}
$types(array)
An array of content types.
Default: only contains 'comment'

Where the hook is called

get_avatar_data()
get_avatar_comment_types
wp-includes/link-template.php 3912
$allowed_comment_types = apply_filters( 'get_avatar_comment_types', array( 'comment' ) );

Where the hook is used (in WP core)

Does not used.