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A comment on Alternatives to Google adwords?.
Bing Ads : https://bingads.microsoft.com/
Facebook ads : https://www.facebook.com/advertising
Yahoo Ads; http://advertising.yahoo.com
It really depends on what you are targetting, ie. you want to target based on location, interests etc. Also you should start to expand your keywords on AdWords, try split tests of different texts and see if you can bring your CPA down.
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Bing Ads : https://bingads.microsoft.com/
Facebook ads : https://www.facebook.com/advertising
Yahoo Ads; http://advertising.yahoo.com
It really depends on what you are targetting, ie. you want to target based on location, interests etc. Also you should start to expand your keywords on AdWords, try split tests of different texts and see if you can bring your CPA down.