Photographing private property from within the public domain is legal, with the exception of an area that is generally regarded as private, such as a bedroom, bathroom, or hotel room[37]. In some states, there is no definition of "private," in which case there is a general expectation of privacy. Should the subjects not attempt to conceal their private affairs, their actions immediately become public to a photographer using an average lens or video camera.
Just in general sense, the "public figure" shit you mentions is not mentioned herein.
Just to annoy him.
Because I'm his friend on facebook.
Facebook is a public domain, anyone can join.