Facebook is testing a new service that allows local-business owners to offer free Wi-Fi to their customers in exchange for a check-in. Credit this find to developer Tom Waddington, who noticed a new code entry called “social_wifi” to its Page Insights tool. This led to Facebook confirming a service that offers free Wi-Fi to a customer if they check-in at a participating location. The check-in would direct the customer to the business’s Facebook Page. The Page Insights tool suggests that this feature could encompass likes in addition to check-ins. This is a win for Facebook, which would be strengthening its mobile services, an area of its business that has gotten heat recently. (The Next Web)