function bp_core_install_activity_streams() {
	$sql             = array();
	$charset_collate = $GLOBALS['wpdb']->get_charset_collate();
	$bp_prefix       = bp_core_get_table_prefix();

	$sql[] = "CREATE TABLE {$bp_prefix}bp_activity (
				id bigint(20) NOT NULL AUTO_INCREMENT PRIMARY KEY,
				user_id bigint(20) NOT NULL,
				component varchar(75) NOT NULL,
				type varchar(75) NOT NULL,
				action text NOT NULL,
				content longtext NOT NULL,
				primary_link text NOT NULL,
				item_id bigint(20) NOT NULL,
				secondary_item_id bigint(20) DEFAULT NULL,
				date_recorded datetime NOT NULL,
				hide_sitewide bool DEFAULT 0,
				mptt_left int(11) NOT NULL DEFAULT 0,
				mptt_right int(11) NOT NULL DEFAULT 0,
				is_spam tinyint(1) NOT NULL DEFAULT 0,
				KEY date_recorded (date_recorded),
				KEY user_id (user_id),
				KEY item_id (item_id),
				KEY secondary_item_id (secondary_item_id),
				KEY component (component),
				KEY type (type),
				KEY mptt_left (mptt_left),
				KEY mptt_right (mptt_right),
				KEY hide_sitewide (hide_sitewide),
				KEY is_spam (is_spam)
			) {$charset_collate};";

	$sql[] = "CREATE TABLE {$bp_prefix}bp_activity_meta (
				id bigint(20) NOT NULL AUTO_INCREMENT PRIMARY KEY,
				activity_id bigint(20) NOT NULL,
				meta_key varchar(255) DEFAULT NULL,
				meta_value longtext DEFAULT NULL,
				KEY activity_id (activity_id),
				KEY meta_key (meta_key(191))
			) {$charset_collate};";

	dbDelta( $sql );
}