This document discusses how to maintain connections on LinkedIn through regular communication ("pinging"). It recommends growing your network, regularly updating your connections with your activities, and recommending others, which will help you receive recommendations in return. Specific tips include sending personalized connection requests and messages to contacts, writing detailed recommendations for others mentioning specific accomplishments or skills, and connecting with people in your offline network or through LinkedIn search and 2nd degree connections. Maintaining active communication through updates and messages helps your network stay engaged with each other.