Popup Opt-in Forms: Case Studies, WordPress Plugins, and Alternatives
Kikolani
MAY 28, 2013
How to Get 1000% Increase in Opt-ins Test Results (2008) – The test demonstrated that the time-delay hover box works, and it works best at 60 seconds. You can also try the free Optin Revolution Lite if you just want basic features without analytics. Popup Opt-In Form Case Studies. Here are just a few for your reading pleasure.
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