I'm not sure if this is still the case, but I remember hearing a year and a half ago or so that the Instagram team was still pretty small then. FB is pretty lea

I'm not sure if this is still the case, but I remember hearing a year and a half ago or so that the Instagram team was still pretty small then. FB is pretty lean in terms of number of frontend devs - at that time I remember being told the number was ~250 or so, which has probably grown since then.