The outage has largely affected mainland Europe and south-east Asia, though the UK appears to have been spared the social meltdown.
Photo-sharing site Instagram has been having issues since around 7am (GMT) this morning, according to Down Detector.
It says more than 400 people have reported problems with the website during that time.
As always, the reaction on other functioning social media platforms has been immediate and hilarious.
Several memes depict chaos at Facebook HQ after several people in south-east Asia and across mainland Europe complained of outages.
