What is free-video-tool.com and keywords-monitoring-your-success.com?

free-video-tool.com and keywords-monitoring-your-success.com are common examples of referrer spam, which is also known as referral spam, log spam and referrer bombing. This happens when a spammer sends fake hits to a legitimate website using their own spam sites as the referring URL. The spam site then shows up in the site's statistics/analytics logs (such as Google Analytics or Statcounter) as a referring URL. If the statistics are public, this creates a backlink to the spammer's site, which improves the spammer's search engine ranking. The targeted website's owner may also be curious about the spam site constantly showing up as a referring URL and click it themselves, unaware that it's simply a spammer.