Roger Lee has created a fantastic free service to track your LinkedIn contacts job changes. Whether a person has been promoted or changed businesses, this is a fantastic way to keep in touch.
Visit JobChangeNotifier.com and connect it with your LinkedIn account. Then scroll through your network to choose who you wish to track. It's easy. Once you have this set up, you will receive an email alerting you of a job change.
The next step is important
Be sure to reach out to your contact to congratulate them directly. Send them an email or call them. Perhaps you are due for a lunch or coffee to learn more about the new role and to catch up in person.
Remember networking is a two-way street. Ask how you can help others before you ask for something.