A couple of thoughts:
* As much as I enjoy forwarding and debating my own political ideas in settings where I think there's an opportunity, I've never considered work a primary venue for this, and the premise that political diversity should be a priority for a business is one that doesn't seem to have any kind of supporting argument. Companies exist to organize an economic activity. Other activity is incidental. Ideally your employment status is not affected by outside expressions. Beyond that, I'm not sure what you expect to accomplish internally. Especially if the gestalt is different.
* If Mr. Amerige is a fan of Rand, perhaps he should consider that those who own FB would, under Rand's philosophy, apparently be quite entitled to do whatever the hell they feel like with the company, obligate employees to take whatever position they like or leave.
* I've spent time arguing center-to-somewhat-conservative views on liberal websites like Metafilter. I've spent time forwarding nuanced religious or rationalist points in congregations of believing Mormons. I lean center left among family and friends who often lean pretty right. I know exactly what it's like to have to make a case in front of an audience that's not at all sympathetic to your point of view. Yep, sometimes it's super frustrating. I'm not seeing any discussion of particular consequences at Facebook, though, so it's impossible to tell if Amerige and any who agree with him are facing anything more difficult than the near inescapable social accountability for expressing a view where the stakes are a loss of some respect and gaining a bit of baseline hostility/distrust. And my experience is that even if it's an uphill battle, if you're patient and your position is genuinely well thought-out, it's often possible to make some measure of persuasion to people who you're giving both a reason to like you and a reason to think about what you're saying.