Déclaration des droits et responsabilités. Politique de confidentialité. Paramètres de confidentialité. Like Button - Développeurs de Facebook. Why are people seeing a 'Confirm' button when they click on my Like button?
There are integrity and spam-prevention safeguards built into social plugins, and this is one of them. If you have been heavily testing a Like button before launching, you may have inadvertently triggered these safeguards. Additionally certain domains on the internet are more likely to contain spam, so will see the confirm step more often.