I have given a stranger a ride. Each year here in Michigan we have the
Michigan Air Tour(http://s127415377.onlinehome.us/) which is in the
fall and runs from Friday to Sunday stopping at different airports in
Michigan. It is an effort to support GA in Michigan and is fun for all
involved. 2 years ago I was asked to give a ride back to YIP with
someone that I didn't know. I did give her a ride, but was somewhat
reluctant. She was not a pilot and on the trip back I kept her busy
reading the sectional. We arrived without any problems and she even
took the time to send me a thank you note.

Although my experience was good, I have known others to be nightmares.
I know pilots that will not give someone they don't know a ride.
Afraid of getting sued I guess. YMMV.

Regards,
Jerry