Today I've seen quite a few of my domains receive extra 100 - 500 referring domains. They can be seen in Majestic, not yet in Ahrefs. I have contacted Majestic whether or not they are planning to filter these out, we will see. These come from automated spamblogs like: http://web-seek.org/the_worlds_most_visited_web_pages_455/ http://web-pages.net/the_worlds_most_visited_web_pages_455/ http://advertisewebpage.net/the_worlds_most_visited_web_pages_455/ Homepages of these sites redirect to "http://theglobe.net/index.php" These sites are not indexed, so they shouldn't be harmful, however, be very careful what you are buying in the upcoming few days, referring domains might be significantly inflated. Also, don't panic if you see your site being hit by these, especially premium auction sites. It should not do any harm, it's just a massive annoyance.