Say goodbye to those messages on Facebook asking you to send your friends a gift on their birthdays. A year ago, Facebook killed off the part of its Gifts service that allowed users to order physical presents through the social network. Now, the company says it is shutting down the remainder of the Gifts business, which allowed you to send digital gift cards to friends on the social network, on August 12. Facebook said the decision comes as it is focusing more effort on helping developers and businesses use Facebook to increase their own sales rather than on turning Facebook into an online store itself. Facebook recently started testing out a “Buy” button that would allow some businesses to sell products and services directly through Facebook advertisements or Facebook posts.