I don't broadcast it, but I'll tell virtually anybody who asks me, although I avoid the word fetish because if its negative connotations.
The first time I told a couple of guys at work, I was a little nervous, but basically I was told that as fetishes go, a love of being tickled by women was pretty benign. I began to think of the fetishes that involves pain and injury, not to mention feces and urine, and I concluded that tickling is the best fetish.
I often let people hear my song, Tickle Tackle, and they ask what prompted those lyrics. Why the tickling? they ask. I tell them, "It's what I like. It's my thing. It's my bag, baby." They laugh and that's usually all there is to it.