To be honest I've never checked. Ola's answer here http://www.quora.com/How-many-lines-of-code-is-Facebook http://www.quora.com/How-many-lines-of-code-is-Facebo

To be honest I've never checked. Ola's answer here http://www.quora.com/How-many-lines-of-code-is-Facebook http://www.quora.com/How-many-lines-of-code-is-Facebook sounds about right (he seems to be talking about all code). I should amend my previous comment though; most place I've worked at that are within a couple of orders of magnitude of Facebook's size have developed or adopted abstractions that constitute the majority of code engineers interact with.