I have a dilemma: should I withhold my feelings on the internet to spare the feelings of close friends/family the same as I do in real life?

Mainly my issues arises when I want to talk politics or religion. I don’t make public my beliefs to certain people because they do not agree with me; and honestly I don’t feel as if it will do them any good to know such things.

But should I feel free to speak my mind on the interwebs? I link to this blog not only from my website, but also from my other online presences (Facebook, my family site, etc.), and those from whom I withhold information in my real life can easily see it in my cyber-life. If I am interested in shielding them do I have an obligation to do so in all realms?

OR – is this blog a sounding board for my ideas, thoughts and feelings?