When coming up with clever new engagement campaigns I always think it's worth considering what the barriers to entry are and how they can potentially be lowered. Just think if you put this in front of 100 people how many people would you not be able to get to because the barrier to entry is too high or not relevant. If the campaigns just for people with iPhones you rule out everyone without an iPhone, if it's for young families you rule out everyone without children.
Here's an example I came across yesterday.
I thought this A board outside Starbucks looked interesting so I went in, no barrier to entry, successful conversion so far.
The second step in the process involves a £15.95 book purchase barrier to entry however, too high for me.
Then the third step involves having to ask a cashier for a flyer hidden by the till, not too high for me but too high for most I'd imagine.
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