Unless you enforce a strict selectivity policy, there's a good chance your LinkedIn network has some significant percentage of complete strangers who may never be able to help you professionally--or who may, and you'd never know it.

New mobile app Broadli aims to rein in the perpetual disorganization of professional social networks, helping people find those connections, or connections of connections, who can help them most, and vice versa.

Created by New Zealand-born entrepreneur Claudia Batten and Alessandra Lariu, cofounder of global women's digital marketing network SheSays and one of Fast Company's Most Creative People 2010, Broadli is an attempt, says Batten, to "digitize serendipity"--that is, use networks better to increase the chances of connecting with the right person at the right time....