See how many users have the app nearby from the home screen. On the app go to Menu>Home to see how the Lightcatch users near you.
Below is a screen shot of the Home screen for Lightcatch in my home town of Grande Prairie, Alberta. Those coloured boxes shows there are hundreds of people in and around the city with the app.
The more people that use Lightcatch near you the better crime can be stopped before it happens.
To share the app I recommend people go to www.lightcatch.net/download . Download links for the iPhone and Android are on the home page.