Hello my friends i need your ideas and comments.

i need a web app. This app for a cafe or restaurant, for usage example;

after the user connect the wireless in our restaurant, we dricet the user a web page or web app, this page have written you have to share this post like "I am here" with swarm or facebook or twitter or vk

what i need for the develop this application. if someone give me advice i am really glad :)

if you know a similar applications can you share me. 

thank you all..