Welcome to the Q&A Forum

eyepaq, Thanks a lot for your time on studying my site and for your input on this matter. I have never received a message from Google about spam issues on this site and I just checked the "manual" section and it's empty. I'm afraid it could have been hacked as you stated above, I will need to audit all my link profile. Cheers

Michael, Yes, that's what I have in mind, maybe I didn't explain it well but that exactly the idea ...I am just not so sure how to 301 redirect the main domain, I will discuss with my programmer the code you provided on your answer. Cheers

Also, the anchor text of those links will determine the effects. For example, if you eliminate many URL-only links and you had too high a percentage of those (>40%) in your anchor text portfolio, it could benefit your overall ranking. However, if you eliminate keyworded anchor text, you might lose ranking. This is another dimension of the possible outcomes to analyze in addition to link juice. In general, if a link is from a non-relevant or low authority domain and does not have useful anchor text, it is easy to remove with confidence. But if it the linking domain has relevance, authority, or links with anchor text, it is worth holding off while you clean up others.

More is best. C Block refers to the "group" that an IP address links to.  Lots of domains linking from the same C Block might suggest related sites or a network.  Having your links coming from a wider spread of C Blocks is generally seen as good. Like with most things in SEO it is not just a case of "more wins".  the C Block of a site that links to you is just one factor amongst hundreds, maybe thousands that influence rankings.  Most importantly an unusually low number compared with linking root domains can be a sign of something odd.

Hi Matias. Now that it's been a few months, I was curious to see if you were able to get your traffic back. Let us know if there has been some progress and what actions helped cure the curse.