Alumni of an organization long have been recognized as sources of new business and employee referrals, as well as for their potential roles as customers and rehired employees. Maintaining these relationships for life and connecting alumni electronically, with each other and with current employees, can escalate these benefits by fostering connectivity and information flow.
For example, KPMG set up a corporate alumni social network in the spring of 2007, aiming to better connect current and former employees, keep them up to date on corporate news, events and job openings, foster a more collaborative environment, and provide KPMG executives with an easy way to stay in touch with former employees.
KPMG has signed up approximately 10,000 former and current employees on its corporate social network. KPMG credits its network with helping it hire 137 former employees, or around 14 percent of the company’s total hires, since the network’s launch, up from 72 people in the three months prior. This increase in the number of rehires delivers significant benefits to the organization — from cost savings to productivity improvements and increased goodwill among employees.
Additional benefits include access to the knowledge experienced alumni hold, the ability to inform opinions and discussions alumni have about the organization, and the potential to create positive impressions for individuals who may remain shareholders or customers of the organization. Such brand ambassadorship, whether for an organization’s employment or corporate brand, can have substantive results.

Great info - keep up the great work.