Facebook, Instagram and WhatsApp experienced network problems around the world, including in South Africa, on Wednesday afternoon.
This follows similar outages of popular South African websites such as Takealot.com, MyBroadband and News24.com in the past week.
The outages appear to be connected to US cybersecurity firm Cloudflare which has been affected by an outage at telecommunications provider Verizon.
The website has been responsible for downtime on multiple sites.
Downdetector.com showed that the platforms were particularly hard hit in Europe and the East Coast of the United States.
The first outage issues were reported shortly before 16:00 today.