"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.
People on Twitter hilariously dragged Mark Zuckerberg's new “metaverse” offering – a virtual reality remote work app.
The Facebook founder's clip involves an electric surfboard, the American flag and John Denver.
The former president, now suspended from social media, congratulated the country on its national Twitter ban.
There are conditions, but the former president could return to the platform before the 2024 election.