Thats why I never told to any of my friends about my sites and knowing them there is no chance that any of them will ever come across any of my sites.
Try to monitor you adsense account as much as possible, and if you notice a lot of clicks, disable your ads and contact Google.
You can appeal, but usually once you get invalid clicks from google its bad..very bad. Best of luck. Next site you use a advertising publisher on..Don't tell your friends or family about the sites to protect your account.
Its a guilty until proven innocent approach to doing business. Tell your friend he's an idiot and move on.
does adsense only ban your account before payment date? Do they warn before banning if they see any abnormal activity with your account? I haven't got paid yet but will be eventually when i reach $100. Has anyone have their account disabled JUST before the FIRST payment?
They're so cruel, that they can even ban your account after your checks are delivered, and then put stop-payment on your cheques.