Aaron Greenspan, a Harvard acquaintance of Mark Zuckerberg's, has published never-before-seen IMs allegedly written by Greenspan and Facebook's co-founder over a six-month period in 2004.
The IMs cover a range of topics including Facebook's launch, its similarity to Greenspan's company, HouseSYSTEM, and Zuckerberg's high school friend and Quora co-founder, Adam D'Angelo.
Greenspan says he found the IMs last week while hunting for information about Charlie Cheever, Quora's recently departed co-founder, from his junior year of college.
"It turns out that my 'Other folder' contained some of the most important legal evidence regarding the origins of Facebook, Inc. that I had been trying to find for years, but without much success." Greenspan writes.
Greenspan has long been at odds with Zuckerberg. When Zuckerberg tried to trademark the word "Facebook" in 2009, Greenspan opposed him. The pair reached a settlement.
Greenspan later sued "The Social Network" movie producers, claiming he should have been included in the story of Facebook's history.
For years, Greenspan has been trying to show how Mark Zuckerberg wronged him.
"Mark has a pattern of pathologically lying to people," Greenspan tells Business Insider. "It's not just me, it's not just the Winklevosses, it's not just Adam, not just Eduardo. It…