OK I blurr Faces too, but often I see Pics where it is not understandable why they are blurred.
When you can see their living room, garden or tatoos/pircings or something else to identify them if you know them it is silly. If someone sees who knows the person he will identify her, if he doesn`t know the person on the pic he will not be able to identify her, blurred or not blurred.
I found some pics, a time ago, on with you can see a letter with the full name and adress. Funny!
So, if there is no possibility to identify the person, it makes sense, but otherwyse ...