In one case, the LinkedIn profile of a client’s husband led to the discovery of millions in hidden assets, says Stacey Udell, a forensic accountant in Moorestown, N.J. The husband’s updates showed he actively sought new clients for two businesses he hadn’t disclosed, Ms. Udell says. And on one of those company’s websites, his bio bragged about the profitably of the business and his engagement to his “beautiful girlfriend.”