One of the potentially powerful advantages of m-commerce is the ability of sellers to target offers to consumers when they are in close proximity to seller. This is made possible based on smart phone technology that tracks the exact geographical locations of their users. For example, if a consumer is near staples office Superstore, a text message can be automatically sent to consumer's smart phone about a special offer on, say, print cartridges and paper. The technology that has made such m-commerce-based proximity marketing possible was developed by startups such as SHOPKICK, WHERE, and LOOPT, as well as giants such as AT&T's. Although available to anyone with a smart phone, the proximity alerts will only be sent to consumers who have signed up for the program. Analyze the pros and cons of this proximity marketing strategy.