Teams at FB London using C++

I have worked on C and C++ for most my career with a little bit of Java and C#. I am most comfortable amd productive with C++. I am joining FB London as E5 SWE. Are there teams at FB London using C++ ? Which teams are they ? Is the number of teams working on C++ very small ? compared to teams using Java ? Yoe: 12, TC: 160K £