The issue is impacting all of Facebook's apps.
Facebook said through its Twitter account that "we're aware that some people are now having trouble accessing the Facebook family of apps".
On Wednesday's issue, Ms Brooker added on Twitter: "Look at what happens when we let one company control everything".
The outages are mainly in the US, UK, India, Philippines and parts of Latin America.
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Those on Twitter are having some fun with posts about people reacting to Facebook and Instagram being down, and using the #facebookdown.
Meanwhile another user, Layla added: "i can not do anything on my instagram. send messages, like posts, even change my password! nothing is being refreshed or fixed please help. i'm scared i'm being hacked". WhatsApp is in the Facebook family of products too, but it seems to be working.
Others took the opportunity to joke about Facebook's recent privacy scandals. That outage was the second time that month.
The outage is occurring against a political backdrop of legislators in the USA and beyond considering whether large technology firms - not just Facebook - should be broken up.
Has the social outage affected you?