I am reminded of a time a year or two ago when I encountered someone outside of a restaurant handing out coupons for a free burrito. naturally, I asked about one (hey, free food), and then they did the bait-and-switch thing where they say "oh but you have to post about our thing on twitter first".
When I told them I didn't have a twitter account, they said "oh well facebook works too". When I said I didn't have that, they got confused and suggested i-think-it-was-instagram. when I said I
didn't have that either, they just looked extremely confused and handed me the coupon.