Making money online through Adsense and other ad networks

It's known to many that submitting your best blog posts or pages to social bookmarks such as Digg, Reddit, and Netscape is one way to get more traffic pouring in your site. But is it true that the traffic from these bookmarking sites will not bedirectly proportional to your Adsense earnings?

Or does that situation only apply to Digg? Anyone who has experienced the same predicament as these Digital Point forum members:

"Last week I had 10k for 2 days from digg.com but the CTR was only 0.01, only positive thins is you getting alot backlinks thats it."

via SERoundtable