Google Cloud, Facebook, Spotify, Snapchat, Discord and other platforms are down, Downdetector said.
Users in different parts of the globe have been reporting problems with accessing the platforms.
Downdetector is an online platform that provides users with real-time information about the status of various websites and services.
In early October, Facebook and its products - Instagram and Whatsapp - were down for several hours worldwide in what the social media giant later explained as the outage triggered by "configuration changes on the backbone routers that coordinate network traffic."