Number 3 was huge because the stackoverflow answer was used on the site nearly as-is:

Based on forensic analysis of the Silk Road Web Server, I know that the computer code ... includes a customized PHP strip based on 'curl' that is functionally very similar to the computer code described in Ulbricht's posting on Stack Overflow, and includes several lines of code that are identical to lines of code quoted in the posting.

http://www.slate.com/blogs/future_tense/2013/10/02/silk_road...