WordPress at a glance
filter is not described

ms_user_list_site_actions filter-hook . WP 3.1.0

Filters the action links displayed next the sites a user belongs to in the Network Admin Users list table.

Usage

add_filter( 'ms_user_list_site_actions', 'filter_function_name_8766', 10, 2 );
function filter_function_name_8766( $actions, $userblog_id ){
	// filter...

	return $actions;
}
$actions(array)
An array of action links to be displayed.
Default: 'Edit', 'View'
$userblog_id(int)
The site ID.

Where the hook is called

WP_MS_Users_List_Table::column_blogs()
ms_user_list_site_actions
wp-admin/includes/class-wp-ms-users-list-table.php 363
$actions = apply_filters( 'ms_user_list_site_actions', $actions, $val->userblog_id );

Where the hook is used (in WP core)

Does not used.