Which of the following is not an example of social commerce?
a. Wendy offers gift cards to online users for funniest response to various challenges.
b. Pepsi Co. sends live notifications to customers when they are close to a store that sells their products. Disney allows people to book tickets on Facebook without leaving the site.
c. Best Buy has a Web site which can be used to purchase products for pick up in a store.
d. Zappos uses Twitter to send customers coupons when they mention a Zappos product.