Here are few sites from where you can earn money by simply displaying ads.
1. Google Adsense
2. Bidvertiser
3. Chitika
4. AdsOptimal
5. RevenueHits
6. InfoLinks ads
7. Clicksor Ads
8. Affinity Ads
9. AdHitz
10. Propeller Ads
For More Click : http://seoandinternetmarket.com/make-money-online-pay-per-click/
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