The Facebook CEO was "personally involved" in a decision to reinstate the video after Republican politicians complained about its deletion, according to reports.
"According to Facebook, the only way to fix the FB outage is to cover its servers in horse paste."
For many of us, a night of no notifications brought sweet, sweet relief.
"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.
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.