It's the little things

I can't claim to be a genuine font nerd... I mean, there are many, many fonts that I would not be able to name on sight.  But I do find it slightly unsettling that the standard font on my twitter feed is sans serif, and doesn't appear to be customizable.  It doesn't match!  It doesn't maaaatch!   Aaaaagh!  Okay, maybe I am a teensy-tiny bit of a font nerd.