Most of them use PHP, what does that say about their ability? People choose technology that they're more familiar with, not necessary the best out there. Let'

Most of them use PHP, what does that say about their ability? People choose technology that they're more familiar with, not necessary the best out there. Let's not forget that almost all of them use some sort of caching layer in front of MySQL, let's talk about that part of "scaling" shall we? Last but not least, forking MySQL to suit their own needs do not necessarily imply that MySQL scales at their size, which is something you cannot claim. Closing remark: let's say MySQL does scale, what if PostgreSQL scales even better? I'm not a specific RDBMS fans since I use whatever dictates to me (with some exception) but really, the "name-calling" of who's using what should stop.