Facebook's got no love for Google or for Apple. And why should it, Zuckerberg has been poised to destroy Google from the get go or at least build Facebook into something bigger. And Apple ruined his plans of creating an app platform inside the Facebook app on iOS devices.
Of course, competition and rivalry is hardly a bad thing. It's good that the largest web companies are at each other’s' throats. Still, this rivalry stays mostly hidden, companies will largely say nice things about each other or just say nothing.
That's not to say a bit of passive-aggressive behavior doesn't surface from time to time. The spat between Facebook and Google over contact imports is a good example.
Facebook seems particularly adept at this type of "fighting," perhaps because it's the youngest and the smallest of the big web companies. One rather ridiculous example is leaving out Google Chrome and Safari out of the "recommended browsers" page.
If you're visiting Facebook in an unsupported browser you'll get redirected to this static page, informing you your browser is not supported, hinting that some features don't work, and that you can get the full Facebook "experience" if you use one of the browsers the site recommends, Internet Explorer, Firefox and Opera.
Notably missing from there is Google Chrome, by some measurements the most popular browser in the world, and Safari.
This would suggest that the three browsers are the ones supported, but that's not what Facebook is saying, rather it just lists some browsers it "recommends."
To get the true list of supported browsers you have to go elsewhere, to a help page. And, surprisingly or not, both Chrome and Safari are listed as supported. Not listed though is Opera, a browser Facebook recommends.
It is very common for any website, especially large ones, to officially support only the biggest browsers. At the moment, these are Internet Explorer, Chrome, Firefox and Safari. Opera is left out more often than not.
That's not to say the sites won't work in Opera or any other browser, it's just that these browsers are not tested. In Facebook's case, it's unlikely that you'll find any feature that doesn't work in Opera or any other browser, especially those based on WebKit. More complex apps though, like Google Docs, won't work correctly or at all.