Define "follow". My company "follows" development but does not run production servers with it.

There's a lot of public evidence of NetFlix's use of FreeBSD and their desire to generally stay up-to-date. I'm not aware of any credible statement that they're actually on -CURRENT though, and even if they were at some point they may not have updated since then.

They are heavily involved in FreeBSD development and I'm sure they're keeping on top of developments in -CURRENT, but I believe they are not using affected versions anywhere in production.

Even if someone says they do, I don't believe it. As someone who runs -CURRENT on vm's and physical hardware, it's not stable to do anything aside from development and testing on it, and it's not meant to be stable as well on purpose.

Unless Netflix enjoys filesystem wipes, file corruptions, and extremely reduced performance due to kernel level debugging flags that are enabled by default (and often can't be disabled due to ongoing development efforts), then they are not running -CURRENT. Remember, -CURRENT runs slowly because of debugging code!!