Dopplr, a social networking site that allows travelers to share trips in advance with friends, has proved popular with some of the world's most frequent travelers.  In late May the company started allowing its users to add in their favorite haunts as part of an extention of the site's new social atlas feature. CEO Marko Ahtisaari reckons users will eventually be willing to pay to subscribe to info on the best places to stay, eat and explore. Click "read more" to see the video.

Read more