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I have signed up for Alexa's one month free and they gave me an option to list two extra links to my site.
These extra two links do not have a rel attribute, although the main link (1st) to my site has a rel="nofollow" value.
Does this mean that these extra two links are dofollow by default or nofollow?
Here is my site's Alexa page.
If a link has a rel="nofollow" attribute, there is nofollow link. In other case, this is a dofollow link. Two links are thus dofollow.
X-Robots-Tag HTTP response header or robots.txt file or intermediary script can all prevent the link from being considered dofollow by search engines.