I honestly think all the local grocery is getting from me are my grocery-buying habits, which is obvious. I don't use a smart phone, and my store account is set up without email, much less social media. They still manage to send me coupons for what I'm going to buy. However, I'm sure there are plenty of hyper-connected people that make all that information accessible to them without even thinking about it. This comic is from Randall Munroe at xkcd.