> the challenges involved Facebook runs on C++, but is written in PHP, because it's easier to hire PHP developers. Apps run on ObjC / Java / etc and so that re

> the challenges involved Facebook runs on C++, but is written in PHP, because it's easier to hire PHP developers. Apps run on ObjC / Java / etc and so that requires more developers, more languages. If it's just web apps instead, they can leverage their existing base of engineers. Certainly their native client for Android seems to be hurting from a lack of technical clout (for example, you can't read message threads if they get too long).