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Consider this scenario: If you only do this in small numbers and the sites get a decent enough amount of traffic that others are clicking on stuff, Google isn't likely to take notice or do anything about it. But, say someone whom has ads running on adsense, knows who you are and knows who your sites belong to and can identify you to google as well as send the information from these postings along to them...of course google is going to come down on you because they only make money if the company running the ads pays them. So why would google pay you to do something that could cost them money?
And third party is any third party. Whether it's a friend or not is irrelevant. It's any part that isn't a primary party to the agreement between the first party and the second party...hence third party.
And if anyone wants to find out the final word on this, post a url to a site that you have your friends intentionally click on the google adsense ads for you on. I'll send it on to Google and to the people whose sponsored ads your friends have clicked on. If you think it's harmless, you have nothing to fear.