What makes a good Call-To-Action?

Recently The Social M's author Susanna Gebauer shared her tips to write the most effective Call-To-Actions. We know we have to be direct, succinct, visible and eye catching wih our Call-To-Actions but do you consider the dimensions and surroundings when placing the Call-To-Action?

Susanna Gebauer suggests that people avoid clicking on buttons when the button is a shape with sharp edges. To aid in convincing visitors to your site or page to click the Call-To-Action it is more effective to use rounded shapes or shapes with round edges. Susanna shares many more tips from colours to where to place your  Call-To-Action so it is suitable for all types of platforms. Take a look here!