Yes you are right digg.com is not using google adsense. But what do you want to say. Most of the popular websites are not using adsense because they are getting good offers for advertisements from the advertisers.
LOL ... of course they've got better revenues than adsense.. me too adsense haven't worked yet, but in some other fields they pay good..
Many large websites dont use Adsense, maybe their getting better deals elsewhere. If you work hard I still think you can make good money with Adsense.
If you pass that limit (page impression-visitors) you shouldnt use adsense. If you use, must be a problem with you..
Yeah! But several years ago, Digg is really earning huge in adsense. Maybe they find a better way to earn from their website.
Feel free to stop using adsense, then. By the way, how many of these lame threads are you going to start?