Referring friend is the free copyright service credit which is transferred to your account whenever you share advertisements by Copyrobo or third parties under the Subscription account page in different formats on various social media platforms (such as Facebook and Twitter). Credits earned via Referring friend can only be used for files in JPEG and PNG format for Facebook & Email or Twitter & Email options. Copyrobo activates the “Referring friend” for indefinite periods of time. All the subscribers have access to 30 free of charge Copyright services per month. The upper limit for Invite Bonuses is 1 per day and 30 per month. Credits that have not been used within the given period shall expire.