Facebook, Instagram and WhatsApp were down Sunday.
All three social media platforms, including Facebook Messenger, were not loading as of early Sunday morning.
Downdetector.com, a site that monitors site outages, shows Facebook was down since 6:30 a.m. EST in much of the world, with thousands of reported outages concentrated in northeastern U.S., Europe and the Philippines.
Facebook appeared to be back up and running for most users by 9 a.m. EST.
It was not immediately clear what caused the outage or how long the platforms would be down.
An email requesting comment about the outage was sent to Facebook and Instagram.
#FacebookDown, #instagramdown and #whatsappdown were all trending on Twitter globally.
Facebook acquired Instagram in 2012 and WhatsApp in 2014.
There are more than 1.52 billion daily active Facebook users, according to the social media network's website.