Facebook Inc said on Tuesday that it was testing advertising on its Messenger app globally as the world's largest social media company looks to further monetize its popular chat service.

 WhatsApp, a popular messaging service owned by Facebook Inc, suffered a widespread global outage on Wednesday that lasted for several hours before being resolved, 

 Facebook Inc is trying to seize on the technology known as augmented reality, a mix of the real and digital worlds best known from the hit smartphone game Pokemon Go,