If you know your target audience, you can set up the prize in a manner will be most appealing only for that segment. For example, if your business sells eco-friendly sneakers, the obvious option would be to give away a pair of the latest sneakers from your line of products. A cheaper and still relevant prize could be recycled coffee mugs, handcrafted jewelry, or organic cotton activewear.
Offer a reward for customers who buy something from you and show that they checked in at your business on Foursquare using their mobile device. When they do this, they’re telling everyone in their network that they’ve done business with you. Each month, reward the person who gave you the greatest exposure by offering a discount, and asking for their email address.
At the start of my online career i used to think that list building has no benefits but after doing some research on the topic and starting with the link building thing i came to knew it’s importance. It’s really necessary for website and blog owners to build lists or they’ll just let their selves down because list building is the game changer when Search Engines and Social Media doesn’t work for you.