Meta terminology
CSEC
commercial sexual exploitation of children
The commercial form of child sexual exploitation - "sexual abuse or exploitation of a child for the financial benefit of any person or in exchange for anything of value", as the source complaint defines it. That complaint alleges Meta "[f]ostered unmoderated user groups devoted to or facilitating CSEC", and that it fell to outside investigators to "identify vast networks of CSEC on Meta's platforms".
Source
Plaintiffs' filingPlaintiff's Complaint for Abatement and Civil Penalties, New Mexico v. Meta