Muslim women popularised the husband reveal – now it's catching on among other celebs.
The prime minister will appear alongside the Cop26 president Alok Sharma.
Did you post a picture? You're among millions of people who were also caught out.
Puns, memes and requests not to call it Meta.
"According to Facebook, the only way to fix the FB outage is to cover its servers in horse paste."
"Good luck remembering your mum's birthday now, you pieces of s**t," zinged Blaire Erskine.
Rival platform Twitter did not hesitate to mock the outage on Monday night.
It was unusually quiet across social media on Monday.
Sites appear to be working again several hours after outage.
Haugen, who worked on Facebook's civic misinformation team, secretly copied thousands of internal documents before leaving the company in May.