Dopplr, one of the darlings of the early adopter crowd, announced an all-star roster of angel backers this day.

A social network primarily aimed at business travellers, Dopplr informs its users when serendipity delivers themselves and their frequent-flier contacts to the same city.

Its newest shareholders are a suitably globe-trotting and glamorous group. They include Thomson-Reuters chief executive Tom Glocer; Tyler Br