Your previous customers are going to be valuable to your future business. As you get each new customer you want to network with that customer again in the future, to keep your business in their mind, and to keep them on as a walking and talking billboard for your business. The future of your business is going to evolve to include repeat customers, and referral customers, both of which are vital to the ongoing relationship of your business, the consumer, and the local surroundings of your business.
How can you network with your previous customers?
Even if your customers are online or if they are offline, you can network with your customers. A simple note, or email is going to do the trick. Ask about their day; talk with them by name, and offer advice or to continue with the conversation when they have time to chat with you. Talk with your customers about what they have purchased, or what work you have done for them. Ask if there is anything that can be done to improve the process, they went through while dealing with your business.
Network with your largest clients by taking them to lunch, or ordering them something special and having it delivered to...