Paid links (e.g. affiliate links) should have the rel="nofollow" attribute added them to prevent passing on PageRank. But is this necessary if the URL is already blocked by robots.txt? Example: Let's say this is an affiliate link (served with a redirect script). <a href="http://example.com/go/bluehost.com" rel="nofollow">Bluehost</a> Is the rel="nofollow" necessary if robots.txt contains: User-Agent: * Disallow: /go/
Originally asked by Ted Avery on Stack Exchange (webmasters) (CC BY-SA 3.0).
