Only to my Wife, and only because she's met Mark. But I don't tell her anything beyond referencing a funny picture now and then.
My computer is on and open and she can look at it any time. I don't think anything I post would offend or surprise her.
the funny pic thread comes up at work quite often. so they know i am on a musician's forum....but that's it and about as much interest as they have about us.
couple times a week... but I usually say "On my forum..." because it's really the only one that I frequent with any consistent regularity. This forum and Facebook is 98% of my online interactions with people. (barring email).