Brandon Johnson writes about proximity marketing: personalized marketing targeting your mobile phone.

One of the main obstacles for its adoption is the end-user’s concern for privacy. Johnson thinks that is temporary: “I think of a Sheryl Sandburg story I’ve heard during her presentations several times. When Caller ID first came out, users were scared by it. They thought the concept of knowing who’s calling before you picked up was creepy. Now, 20+ years later, we don’t pick up our phones without knowing who’s calling.The user’s perception of the technology completely flipped over a couple of decades.”

Johnson concludes: “I used to believe that the value needed to be balanced for both the user and the marketer, but I now believe that the value for the user needs to be higher than the value for the marketer. Users don’t care if it’s an uneven playing field, they want useful tools and experiences, and if they don’t find what they’re looking for the app is going to be deleted.”