Just so you know, adding rel="nofollow" has never been intended to prevent bots from following those links. Even famous crawlers like Bingbot will sometimes follow, and index pages linked to by "nofollow" links.
The only thing that rel="nofollow" does is tell search engines not to use that link in their PageRank computation.
If you do want to block well-behaved crawlers from crawling parts of your site, the proper way to do that is to use robots.txt rules.
The only thing that rel="nofollow" does is tell search engines not to use that link in their PageRank computation.
If you do want to block well-behaved crawlers from crawling parts of your site, the proper way to do that is to use robots.txt rules.