protected function set_fallback_html( $item_id ) {
		$activity    = new BP_Activity_Activity( $item_id );
		$mentionname = bp_activity_do_mentions() ? ' (@' . bp_activity_get_user_mentionname( $activity->user_id ) . ')' : '';
		$date        = date_i18n( get_option( 'date_format' ), strtotime( $activity->date_recorded ) );

		// Make sure we can use some activity functions that depend on the loop.
		$GLOBALS['activities_template'] = new stdClass;
		$GLOBALS['activities_template']->activity = $activity;

		// 'wp-embedded-content' CSS class is necessary due to how the embed JS works.
		$blockquote = sprintf( '<blockquote class="wp-embedded-content bp-activity-item">%1$s%2$s %3$s</blockquote>',
			bp_activity_get_embed_excerpt( $activity->content ),
			'- ' . bp_core_get_user_displayname( $activity->user_id ) . $mentionname,
			'<a href="' . esc_url( bp_activity_get_permalink( $item_id ) ) . '">' . $date . '</a>'
		);

		// Clean up.
		unset( $GLOBALS['activities_template'] );

		/**
		 * Filters the fallback HTML used when embedding a BP activity item.
		 *
		 * @since 2.6.0
		 *
		 * @param string               $blockquote Current fallback HTML
		 * @param BP_Activity_Activity $activity   Activity object
		 */
		return apply_filters( 'bp_activity_embed_fallback_html', $blockquote, $activity );
	}