protected static function get_activity_data( $activity_ids = array() ) {
		global $wpdb;

		// Bail if no activity ID's passed.
		if ( empty( $activity_ids ) ) {
			return array();
		}

		// Get BuddyPress.
		$bp = buddypress();

		$activities   = array();
		$uncached_ids = bp_get_non_cached_ids( $activity_ids, 'bp_activity' );

		// Prime caches as necessary.
		if ( ! empty( $uncached_ids ) ) {
			// Format the activity ID's for use in the query below.
			$uncached_ids_sql = implode( ',', wp_parse_id_list( $uncached_ids ) );

			// Fetch data from activity table, preserving order.
			$queried_adata = $wpdb->get_results( "SELECT * FROM {$bp->activity->table_name} WHERE id IN ({$uncached_ids_sql})");

			// Put that data into the placeholders created earlier,
			// and add it to the cache.
			foreach ( (array) $queried_adata as $adata ) {
				wp_cache_set( $adata->id, $adata, 'bp_activity' );
			}
		}

		// Now fetch data from the cache.
		foreach ( $activity_ids as $activity_id ) {
			// Integer casting.
			$activity = wp_cache_get( $activity_id, 'bp_activity' );
			if ( ! empty( $activity ) ) {
				$activity->id                = (int) $activity->id;
				$activity->user_id           = (int) $activity->user_id;
				$activity->item_id           = (int) $activity->item_id;
				$activity->secondary_item_id = (int) $activity->secondary_item_id;
				$activity->hide_sitewide     = (int) $activity->hide_sitewide;
				$activity->mptt_left         = (int) $activity->mptt_left;
				$activity->mptt_right        = (int) $activity->mptt_right;
				$activity->is_spam           = (int) $activity->is_spam;
			}

			$activities[] = $activity;
		}

		// Then fetch user data.
		$user_query = new BP_User_Query( array(
			'user_ids'        => wp_list_pluck( $activities, 'user_id' ),
			'populate_extras' => false,
		) );

		// Associated located user data with activity items.
		foreach ( $activities as $a_index => $a_item ) {
			$a_user_id = intval( $a_item->user_id );
			$a_user    = isset( $user_query->results[ $a_user_id ] ) ? $user_query->results[ $a_user_id ] : '';

			if ( !empty( $a_user ) ) {
				$activities[ $a_index ]->user_email    = $a_user->user_email;
				$activities[ $a_index ]->user_nicename = $a_user->user_nicename;
				$activities[ $a_index ]->user_login    = $a_user->user_login;
				$activities[ $a_index ]->display_name  = $a_user->display_name;
			}
		}

		return $activities;
	}