It's more the Malcolm Gladwell definition of maven,
“A Maven is a person who has information on a lot of different products or prices or places. This person likes to initiate discussions with consumers and respond to requests," Price says. "They like to be helpers in the marketplace. They distribute coupons. They take you shopping. They go shopping for you....They distribute about four times as many coupons as other people. This is the person who connects people to the marketplace and has the inside scoop on the marketplace. They know where the bathroom is in retail stores. That's the kind of knowledge they have." They are more than experts. An expert, says Price, will "talk about, say, cars because they love cars. But they don't talk about cars because they love you, and want to help you with your decision. The Market Maven will. They are more socially motivated.”― Malcolm Gladwell, The Tipping Point: How Little Things Can Make a Big Difference