Facebook sends 13 times more clicks to news sites than Twitter in France. That rate is consistent with what Hitwise found in the U.S. in March. In May, Facebook was the number-seven referral giver to UK newspaper websites, but Twitter wasn’t even included in the list of 19.
You just need to provide number of visitors and conversions for control and variations. The spreadsheet will automatically calculate for you significance, p-value, z-value and other relevant metrics for any kind of split testing (including Adwords).