Give people some sliders and a rest button in their preferences. I find the lack of visual configurability in web apps deplorable. I hate having no control over the look of things unless I install a restyling plugin.

I do find it a little ironic that JZ has taken to Medium to say this, since that platform shares a lot of the visual sensibility with the old FB feed - titles sitting inside the image frame, minimalist icon-driven design and so on.