I don't prefer generic messages or statements. What I have to say I shall say when it is time to say it. I do post rather extensively in the forums, which should establish the validity of my existence.
I don't add as friends anyone with whom I exchange messages about a possible relationship, as that ought remain private. All my friends - straight/gay/Dom/sub - are added because of intellectual or philosophical agreement on various matters.
Last, sub rosa is Latin. It doesn't mean submissive.