Users said they are unable to post any new messages or like other people's posts as thousands of complaints flood in online.
Thousands of people complained of problems on the Down Detector website, which records outages.
Pages remained visible but apparently could not be updated.
Instagram user Nicole Cieslak said: "I'm in the US and cannot post anything to my feed or to my stories.
"It's failed multiple times and now it's just stuck 3/4 of the way through loading."
Victoria added: "Down in Estonia. Can’t post anything, didn’t load the feed. I then deleted the app and downloaded it again but now it wont let me log in."
We've asked Facebook and Instagram for comment and will update this story with any response.
More to follow…
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