I can't say anyone has ever questioned my taking pictures of electrical systems, although my very tiny (and poor, sorry!) camera is readily hidden. I must say that I did feel a little a little like a spy when sneaking a photo of a DIY store's "How to" display a while ago.
No one's here posting pics saying "XYZ Electrical installed this at 123 Main St.."
Quoting the name of the outfit who did the work could, I suppose, lead to litigation in today's world. It would also be rather bad form to reveal the address of a private establishment -- After all, in many cases the owner is not the one to blame.
How about a dangerous situation appearing in publicly owned property though? If I were to post pictures of bad wiring and say "This is in the ****** Building in *****" would that be considered more acceptable to most people do you think?