If a site involves in digg exchange or stumbleupon exchange, or say buy diggs, visitors etc, but NOT clicks. Only generate traffic artificially, will that violate Adsense TOS? A quick reply is desirable. Thanks.
If you are taking advantage of social networking sites to get traffic, it should have nothing to do with AdSense. You're OK, IMO. Social networking sites are popular and the traffic isn't auto-surf, so you should be fine.