Part 5/7:
As Facebook expands beyond Harvard, the Winklevoss twins feel betrayed when they discover that Mark has essentially stolen their idea. They initiate legal action against him, alleging that he appropriated their concept for his own gain. Meanwhile, Eduardo grows increasingly suspicious of Mark's alliance with Parker and the way he is marginalized in the nascent company.
The tension culminates in a devastating betrayal for Eduardo—while he had believed he was a co-founder, Mark dilutes his shares, reducing his stake drastically and leaving him feeling betrayed and lost. Their friendship shatters as Eduardo realizes he is no longer a valued partner in the rapidly growing Facebook.