Every idea should encourage participation through an action that leaves a digital footprint for others to see and also take action. An impression alone is not enough, as there is no way for others to share or pass it on to continue spreading the idea. An action creates more impressions through a multiplying effect as friends can continue participating and driving more actions. The document recommends learning how to create ideas that encourage actions in order to increase the reach of campaigns, make them more memorable and create lasting impressions.