Yes, i'm sure that viewing a small facebook app with a light background a few times a day will lead to all sorts of eye trouble - much more likely than staring at a black 3.5inch screen for most of the day If nothing else, FB apps generally look very nice and are easy to view outdoors. Sociality is very good, but besides the main menu it's pretty cluttered and looks almost like MS DOS in presentation. That's a general appearance thing beyond the background colour, but certainly, it contributes.