If you offer free Wi-Fi, you can promote your own Facebook page, get new "likes" and the social recommendations of your customers, which increases the visibility, participation and sales to the customer of your business.
The more "I like", the more users. According to Facebook, the average number of friends is 130 per user, who can also click on "Like" in their publications. That means that, depending on the fans you have, multiplied by the number of friends you have, your content could have a viral impact.
After connecting to your Wi-Fi network, customers will be directed to their own homepage. Depending on your configuration, you may have to click on the "Like" page to use the free Internet. You can also post a message on your wall, such as "Enjoy free internet connection @ Starducks Cafe, excellent! :)