[wisniewskit]

Yes, though in this case it's for sites relying on Facebook's login authenticator, not really Facebook itself.

SmartBlock also contains special logic for Google Analytics, Google Publisher Tags, and other trackers that cause sites to break when blocked. It's not meant for their benefit, but the user's.

In fact all browsers have special web-compatibility interventions for sites which don't work correctly in them. Even Chrome. And sometimes even for major sites and services, especially when it comes to anti-tracking features.