Any salesperson would know that remembering a few personal details about a customer or prospect is the first step toward building a relationship. Of course, one shouldn’t be too “salesy,” as anyone can see through manufactured friendliness. Going too far in the wrong direction, the seller can even be seen creepy. That rule equally applies to all types of 1:1 marketing. Just because you know “something” about the person, it doesn’t mean that you “know” the person.