After several attempts I finally managed to block the spam site Updowner which unknowingly pointed directly to many of my links.
It will be a coincidence but after making these changes the accesses have increased significantly.
Here's how I solved it:
- I located Updowner by going to Google Webmaster Tools, Traffic, Links that lead to your site.
- I went to the Updowner.com website, registered and blocked the links to my blog (top left is the link "Do you own this site? Manage it!After clicking on Manage I did nothing but follow the instructions. However, there is also the possibility of I will send an email with the request to remove the link to the blog.
- I inserted in the file Robots.txt of my blog the following line of code:
- While in the blog header I added the following line of code: