How Pepsi Identifies Evangelists
Some companies try and recruit evangelists (loyal customers who help market the company), but I think a wiser route is to identify them by their actions, the way Pepsi does.
RetailEmail Blog: Takeaways from the Email Evolution Conference. 2008-Feb-14, by Chad White:
We identify email forwarders and treat them differently, rewarding them, said Lawrence DiCapua, Pepsi’s senior marketing manager. They reward them by promoting them to a VIP program within their Pepsi Extras loyalty program, along with others who show acts of evangelism. People have to requalify for VIP with each campaign—except for bloggers, some of whom are permanently VIPed.

Okay, I learned about "weak ties," the people who we know more functionally or formally than our friends and family, several years ago. Connecting with your weak ties is the best way to keep up with what's going on in the wider community, including business and job opportunities. Email, blogging and now social networking sites have made it much easier to stay connected with your weak ties, and marketers are dying to have product endorsements circulate through them.
If you can't silence them, put them on the advisory board! Whether or not this strategy works depends on whether or not McDonald's listens to mothers, not on how many of the mothers see inside McDonald's.
To market the Aveo to advertising-avoiding college students, Chevy launched a contest calculated to create evangelists. Teams from several campuses were invited to compete for a new car by taking one to live in for a few days and seeing which team could get the biggest online following of friends. A blog
Detroit News:
Managing the email program to the customer experience, off-Broadway producer Ken Davenport has an excellent method for generating referrals and repeat purchases for shows like
Luxury brands have long courted customers with VIP events, but now mainstream marketers like T-Moblie are sponsoring intimate events where customers can bring their friends and see hot bands in off-beat venues. These events have limited reach, especially since they are not publicized beyond the inner circle. As a method of influencing influentials and creating community, they may pay a high return. I would say they will have to keep track of this audience and how much they advocate the brand in the future.
When I was at the Innovative Marketing Conference in New York last month, I heard presentations from several inventive firms doing "buzz marketing," and talked with a marketing professional who participates in the two P&G "word-of-mouth" intiatives, 
Phillips Norelco's Bodygroom campaign is an official success, but I find it hard to believe they spent only $500,000. However much they spent it was a very smart campaign. Accepting the idea that the product itself is pretty outrageous, they set about having fun with it. They're lucky Howard Stern talked about it, but I think that's calculated luck--a lot of advertisers send him stuff, I'm sure. This campaign demonstrates that understanding your audience, not just throwing money at it, leads to profits. And that web site made it easy for guys to refer each other without having to get personal: "Man, I'm not saying I recommend this product, but you've got to see the web site."

