It is valid. There are thousands of ppl getting naturalized everyday, do you see them posting? Some people have a "he knows it" friend who they ask questions from & likely they post it. As a matter of fact, in all of my family, all computer literate folks, but won't go on messageboards..instead they call me up to ask.
So it's all possible. My alternator died in my car so I asked my "friend" and he called some car talk where we found out that it was recalled in 07. So my "friend" is legit.