"every time someone hails a cab, hailo charges them a booking fee for hailing. in an off-peak time, as an example, it's $1.50. we take $1 of that, and we give 50 cents to the driver, so the driver gets their fare, their tip, and a service fee from us." a year-and-a-half ago, it was the 12th company in london to enter the business of e- hailing, as it's called. now, it dominates the market, attracting more than $30 million in venture capital from investors including union square investors, early backers of twitter, foursquare and tumblr; entrepreneur richard branson; and tom barr, a former executive at starbucks. "my bet is, it's for brand awareness, marketing, advertising, to get the hailo app out there, so people realize that it exist, so they can use it." for now, hailo is privately held and seeking millions more in venture capital. with just 200 employees worldwide, and a former top executive of shazam econometrics behind it, a lot of people think hailo's meter is off and running. hailo is now the world's largest e-hailing network, and may be particularly use