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http://www.problogger.net/archives/2013/01/30/how-to-use-multivariate-testing-to-build-the-ultimate-opt-in-form/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ProbloggerHelpingBloggersEarnMoney+%28ProBlogger%3A+Helping+Bloggers+Earn+Money%29 January 29, 2013 at 02:06PM

Über Stefan Petersen

Alter Rock 'n' Roller und Online Marketer aus Leidenschaft mit hoher Affinität zu SEO, Web 2.0, Social Media und Online Marketing.

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