can you give me the pros and cons of these sites?

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I have searched a lot and got some sites name here . Can you tell me the sites' reality in terms of quality and earning. I want the sites' pay procedures(are they paying page views or per article and your experience} 1.yahoo contributor network 2.marketforums.org 3.Rewards-Spot.com 4.http://www.wisebread.com 5.http://absolutewrite.com/ 5.http://www.workplacelikehome.com 6.http://www.wahm.com