The most significant data event affecting users from the 2020 period was discovered in , when personal data from over 530 million users was posted on a hacking forum. This dataset included information harvested through a vulnerability that existed in 2019 and throughout 2020. Common Hacking Methods Observed David Summerrow - Facebook

: Many passwords "cracked" or leaked in 2020 were part of "credential stuffing" lists—massive datasets of 16 billion credentials harvested from multiple sources over several years. The "2021 Mega-Breach" (Linked to 2020 Data)

While many large-scale breaches were reported later, 2020 was a pivotal year for Facebook security due to increased phishing and state-sponsored activity:

: In February 2020, Chinese state-linked hackers allegedly targeted immunologists and virologists via various platforms to steal COVID-19 vaccine data.