Adfly is an innovative service that has taken making money online, one step further. All you need to do is just  shorten all your lengthy URLs with the adf.ly service and then share these shortened links with your friends or visitors. Whenever they click on your adf.ly shortened links, they will be shown an ad before being taken to the original page.

What you earn depends on how many people click on your shortened links. And you get paid provided you have deposited atleast over 20 USD in your account. Ads are shown by keyword and country and like other keyword based ad services you can also place your ads on adf.ly

Related: Start a URL Shortening service and earn in millions