Facebook and Wikipedia (and Wordpress) were born outside the software engineering establishment using lowest common denominator tools [1]. There's a reason for that: LAMP/WAMP has an extremely lower barrier to entry. A billion monkeys banging away on typewriters can make world-beating products, even if they don't compare to the works of Shakespeare in terms of literary quality.
Once these products prove themselves in the market then "professionals" are brought in to handle them, and these people probably know and like more refined tools such as Python or Java or something. It doesn't matter what language these new caretakers would choose for a rewrite though; PHP gave their system its first breath and that's how it stays long past the point in the lifecycle where PHP is a competitive advantage.
Once these products prove themselves in the market then "professionals" are brought in to handle them, and these people probably know and like more refined tools such as Python or Java or something. It doesn't matter what language these new caretakers would choose for a rewrite though; PHP gave their system its first breath and that's how it stays long past the point in the lifecycle where PHP is a competitive advantage.
[1] http://en.wikipedia.org/wiki/MediaWiki#History