When it comes to strangers, I don't even feel comfortable giving my cell #. Strangers are strangers, and there are just way too many crazies out there. Therefore, just to be on the safe side, I try to stick with friends of friends. Even then, I shy away from giving my #. A great escape/excuse is usually that niether one of us has a pen. Therefore, what normally happens is, I mention that "oh, well you know so and so(a mutual friend) he/she has my number" My thought being, that if they are that interesed, they'll do a some leg work. (Plus it gives me little extra time to get the scoop)