UK, US, Asia and Europe appear to be hardest hit in the latest in a string of outages.
Reported Instagram issues include posting, seeing stories and loading content.
Facebook users say they are having trouble logging in and accessing their feeds.
WhatsApp users can’t send or receive messages and a small number can’t log-in.
Users around the world are experiencing difficulty accessing social media sites Instagram and Facebook as well as encrypted messenger WhatsApp.
Reports have come in from further afield, including Australia, Brazil, Colombia, Japan, Mexico, The Philippines, India, Russia, Singapore, South Africa and Uruguay.
Reports for Instagram alone via the site had reached 4,300 at the time of writing.
Instagram issues centre around posting to the news feed, seeing stories and loading content.
Facebook users say they are having trouble logging in and accessing their feeds, as well as viewing or posting pictures.
WhatsApp is failing to send or receive messages, as well as offering a poor connection and a small number of users are unable to log-in.