[ben_w]

He copied the analog thing of the same name in his university that was taking too long to digitise: https://en.wikipedia.org/wiki/Face_book

[soperj]

There's a whole movie about it. He was employed to create a social media platform, and ended up stealing the code to do it for himself instead.

[gowld]

It was already digitized. He wanted to make a version without security and privacy protections.

He also copied Friendster.