chpwn, the famous hacker who discovered an exploit for the tablet iPad 3, developed the tweak zephyr and has contributed to the development of almost every jailbreak solution for iOS, he will probably become a Facebook employee. He announced an hour ago on Twitter that he just finished his first day of internship at Facebook, so he is not employed yet, but this will probably be finalized in a few weeks/months. chpwn is one of the most famous developers of tweaks and applications for Cydia, and the trainee position at Facebook is a normal thing considering his knowledge.
comex started as an intern at Apple last year and now he is most likely an employee of the company and I expect that in the case of chpwn things will not be that different. Now the jailbreaking community has lost another important hacker and I say this because the new job will no longer give chpwn the freedom to develop whatever he wants. We must not forget the fact that geohot worked for almost a year at Facebook after which he resigned, so it is not known how long chpwn will last.
