populate comments and posts in bp-activity

populate.php

<?php

$site_id = 7177;

switch_to_blog( $site_id );
$links = get_bookmarks( array(
	'category_name' => 'Course Blogs',
) );

$urls = wp_list_pluck( $links, 'link_url' );
restore_current_blog();

global $wpdb;
$site_ids = array();
foreach ( $urls as $url ) {
	$parts = parse_url( $url );
	$site_ids[ $url ] = $wpdb->get_var( $wpdb->prepare( "SELECT blog_id FROM {$wpdb->blogs} WHERE domain = %s", $parts['host'] ) );
}

foreach ( $site_ids as $site_id ) {
	switch_to_blog( $site_id );
	add_post_type_support( 'post', 'buddypress-activity' );
	$q = new WP_Query( array(
		'post_type' => 'post',
		'post_status' => 'publish',
		'posts_per_page' => -1,
	) );

	foreach ( $q->posts as $the_post ) {
		if ( 1 == $the_post->ID ) {
			continue;
		}

		bp_activity_post_type_publish( $the_post->ID, $the_post );

		$post_comments = get_comments( array(
			'post_id' => $the_post->ID,
			'status' => 'approve',
		) );

		foreach ( $post_comments as $the_comment ) {
			bp_activity_post_type_comment( $the_comment->comment_ID, true );
		}
	}

	restore_current_blog();
}