When asking people to sign a petition, Facebook titles with a direct call to action outperform those using a curiosity gap.
When asking your online community to share with friends by email, what subject line should you ask them to use? The answer can make a big difference on your action rates.
How did CREDO recruit over 24,000 new users to fight back against a dangerous giveaway to Monsanto? A major factor was optimizing their social sharing.