Online advertising can be expensive and not always effective for brick and mortar businesses. A Hong Kong based company FansWave Ltd. developed a WiFi router called FansWiFi, this offers a very smart solution to harness the power of social media and mouth to mouth marketing.
The main feature of the FansWiFi router, is to offer free WiFi access to walk-in customers, in exchange for a Weibo or Facebook like. The business gets better social media exposure and a more effective marketing platform to generate new customers. For more info checkout the FansWiFI website.