I'm registered to Google AdSense and I've the ads block and some AdSense referrals buttons on my Italian blog. Yesterday, looking at my earnings I noticed that I was giving 5$ for the AdSense referral product. I knew that for that product the rule was: When a publisher who signed up for Google AdSense through your referral earns their first $100 within 180 days of sign-up, you will be credited with $100. So why did I get $5? I thought that it was very difficult for someone that signs up for the first time to reach $100 in...