From my experience with Adsense I got disapproved after a visit from a URL to my blog. The URL was SPAM which is known as REFERRAL SPAM. See more about REFERRAL SPAM here. Why Adsense account got disapproved of Referral SPAM ? In the Google Adsense policies, It says that you should not pay someone to visit your blog/site. When you are placing the ad on your blog, Google tracks each visit to your blog. When they see a suspicious URL in the traffic sources they count it as a paid to click URL.[READ MORE]
SPAM URL’s in Blogger Traffic Source Stats : What should I do ?
You might have noticed a great volume of sites you never heard of coming to your site apart from Search Engine URL’s. Some of those URL’s are filmhill.com and vampirestat.com. These kind of URL‘s are SPAM. The SPAM site is referring your site but they are not persons, they’re BOTS. These bots are visiting your site just for fun. These bots don’t read your posts or anything. They’re just a pile of robots.[READ MORE]