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How does nofollow work with the Social Graph API (rel="nofollow me")?
If you host user profiles and allow users to link to other profiles on the web, we encourage you to mark those links with the rel="me" microformat so that they can be made available through the Social Graph API. For example:
<a href="http://blog.example.com" rel="me">My blog</a>
However, because these links are user-generated and may sometimes point to untrusted pages, we recommend that these links be marked with nofollow. For example:
<a href="http://blog.example.com" rel="me nofollow">My blog</a>
With rel="me nofollow", Google will continue to treat the rel="nofollow" as expected for search purposes, such as not transferring PageRank. However, for the Social Graph API, we will count the rel="me" link even when included with a nofollow.
If you are able to verify ownership of a link using an identity technology such as OpenID orOAuth, however, you may choose to remove the nofollow link.
To prevent crawling of a rel="me nofollow" URL, you can use robots.txt. Standard robots.txt exclusion rules are respected by both Googlebot and the Social Graph API.
If you host user profiles and allow users to link to other profiles on the web, we encourage you to mark those links with the rel="me" microformat so that they can be made available through the Social Graph API. For example:
<a href="http://blog.example.com" rel="me">My blog</a>
However, because these links are user-generated and may sometimes point to untrusted pages, we recommend that these links be marked with nofollow. For example:
<a href="http://blog.example.com" rel="me nofollow">My blog</a>
With rel="me nofollow", Google will continue to treat the rel="nofollow" as expected for search purposes, such as not transferring PageRank. However, for the Social Graph API, we will count the rel="me" link even when included with a nofollow.
If you are able to verify ownership of a link using an identity technology such as OpenID orOAuth, however, you may choose to remove the nofollow link.
To prevent crawling of a rel="me nofollow" URL, you can use robots.txt. Standard robots.txt exclusion rules are respected by both Googlebot and the Social Graph API.
