Depending on the medium Clovertise provides appropriate mechanism to communicate. For example posting to facebook is a simple click of a button.
To share content using digital signage you can use Chromecast - Clovertise integrates with chromecast. You can use a chrome box or Chromebook in kiosk mode for hands free operation and high end needs. Clovertise provides a chrome app to make this very simple. Or you can use any PC or tablet that runs a browser. You get a lot of flexibility and no need to buy any proprietary devices.
For your web site you insert a one line script in your html and you are good to go.