Seth Godin, author of six bestsellers as "All Markters are Liars", talks about flipping the funnel and turning your customers into a megaphone/salespeople instead of spending millions of ad dollars to convince them every time you launch a new product.
He talks about the Fashion/Permisson Complex meaning that you need a
product which gives you users permission to tell them about your next fashion/product. Once you have their permission you have potential customers and fans talking about your new product. To get their permisson you need the right story at the right time and the right place.
In his speech at Google he mentions that Google still misses permisson assets while Amazon has 16 Million permissons of users reading their mails.
In his point of view Web 2.0 is not about AJAX or better technology but about solutions
which works better the more people use it. In this case users have a selfish motivation to tell their friends
about it allowing for faster growth (e.g. e-bay, myspace).
For more information check his speech live at Google or his ebook "Flipping the funnel".
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