I think the smaller font size is better suited for formal/technical stuff that we try to deal with here.
The entire bio on profiles can be removed, aside from the "About Me" section. In addition, I think it would be appropriate to make creations/contributions a little more prominent than comments and likes.
@Sorasyn Not for the profile pages. They don't need the recent comments/likes navigational elements.
@BlueThen Stackoverflow and Github both use a 14px font size and they're entirely code based. For the profiles Github show posts by default, but the only thing with that is I find myself clicking over to Public Activity 99% of the time, so maybe it is best to keep recent activity as the default.
@Savage_CL Indeed.
I'm also considering increasing the font size. Seems 14px is becoming more and more popular.