You are deliberately trying to miss the point. But in the off chance that you don't really get it, the point is quora, asana were started by early facebook programmers, and they didn't use PHP. If they liked PHP so much, they would have used it.
I can't find a citation, but there was a thread where a fb engineer claimed fb's internal PHP wiki starts with "There are two kind of people. People who hate PHP, and people who don't use PHP."
None use PHP.