Javier Castaño works shining shoes outside a cafe in Malaga, Spain. He also happens to be the owner of some of Twitter’s most desirable handles. But he’s not your typical squatter. He’s not out to make money. He’s just holding onto the handles until he can get them to their rightful owners. WaPo’s Caitlin Dewey introduces you to the Spanish shoeshine guy who secretly guards Twitter’s greatest real estate.