Really?! They developed Hip Hop to transform PHP into C++, so I'd bet they are firmly dedicated to PHP, and I really doubt that Facebook has any problems findi

Really?! They developed Hip Hop to transform PHP into C++, so I'd bet they are firmly dedicated to PHP, and I really doubt that Facebook has any problems finding developers. PHP/C++, Cassandra, JavaScript, Flash, and whatever third party developers choose to use as long as they use the Facebook API. I don't actually know, maybe someone else will give you some more insight, but I'm pretty confident about the PHP part.