bad_referer.conf

map $http_referer $bad_referer {
    hostnames;
    default                         0;
    .semalt.com                     1;
    .kambasoft.com                  1;
    .savetubevideo.com              1;
    .descargar-musica-gratis.net    1;
    .7makemoneyonline.com           1;
    .baixar-musicas-gratis.com      1;
    .iloveitaly.com                 1;
    .iloveitaly.co                  1;
    .ilovevitaly.ru                 1;
    .fbdownloader.com               1;
    .econom.co                      1;
    .buttons-for-website.com        1;
    .buttons-for-your-website.com   1;
    .free-share-buttons.com         1;
    .srecorder.co                   1;
    .darodar.com                    1;
    .priceg.com                     1;
    .blackhatworth.com              1;
    .adviceforum.info               1;
    .hulfingtonpost.com             1;
    .best-seo-offer.com             1;
    .best-seo-solution.com          1;
    .4webmasters.org                1;
    .buy-cheap-online.info          1;
    .event-tracking.com             1;
    .Get-Free-Traffic-Now.com       1;
    .free-social-buttons.com        1;
    .googlsucks.com                 1;
    .buttons-for-your-website.com   1;
    .simple-share-buttons.com       1;
}

# Insert this in server configuration:
# if ($bad_referer) {
#     return 444;
# }