Do you like being approached on the street for surveys?
Someone from a local store comes up to you on the street and ask you to take a survey and offers you a free gift at the end of it. You just need to provide an email address for them to contact you later for the free gift.
How likely is it for you to sign up to them there and then? What kind of free gifts would be attractive enough to do so? Would this be a good idea for a local business to do?