I like to divide preliminary user adoption into two phases: First time marketing and Second time marketing.
The first time you see something, it may get your attention for a couple seconds or for a couple minutes at best. You may get engaged with it and say hey "that's really cool" maybe I'll try it out. And some people say hey "that's really cool" and go on with their business. Note: I'm usually the latter type, it takes me a while to try something new.
It's the second time that you encounter the product that is really the transition period for the user. A thought is triggered along the lines of "hey I've seen this before, I didn't try it out last time, but it still looks like something I want to try".
Take a cellphone for example, when you go to a booth or a store that sells these flashy phones, your first experience with them is hey "thats really cool". But there are so many that the hey "thats really cool" feelings multiplied by the number of phones on display that maybe the phone from your company gets missed by the customer and they decide not to try it out that time. The second time they come around, is when you need to have something there that really appeals to them.
The second visit to the product/service/advertisement is the moment where acquiring this user is crucial. If a person doesn't try it on the second attempt, you will have to be severely persuasive or increase your value proposition to get the user further down the line -- it's a very difficult task because if the person didn't take a liking to what you are selling two times in a row, there must be something wrong that has to be addressed. Be aware of second-time marketing, because chances are, if your product is good enough, your potential customers will come back and your chance to snag them up is crucially important.
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