Battle of Las Navas de Tolosa: Armed confrontation that took place on July 16, 1212, near Jaén, in the south of present-day Spain, in the context of the Christian Reconquest of the Iberian Peninsula.

When Facebook opened its desktop site to third-party sellers, it seemed like a win-win for users and businesses. Users would have more options when buying things, while businesses could expand their reach. But in practice, the rollout has been rocky. With this many people using Facebook on mobile devices and...