Facebook's biggest problem in the next few years is going to be that it will struggle to attract new talent. Simply put if you're a senior SWE, even the possibility of FB putting a stain on your resume is going to drive you away, because there are so many other options out there. It's not worth the risk of always having to explain your time there because everyone has an opinion on the company these days. It's not that Facebook isn't a great place to work, it probably is. It's the fact that if you're at the level where you can get hired by Facebook, there are many many other options to reach for and the vast majority of people at that level are just going to reach for those other companies that are just as prestigious but carry none of the stigma.