What happens to my location data?

It is deleted from the server as soon as you turn Mecto off.

I tried to use Mecto but I get an error saying "We couldn't connect you to Mecto, please check your internet connection."

Once you have confirmed internet connection, check if your browser has permission to access your current location data.

For Apple devices:
Go to Settings > General > Location Services.
Make sure Location Services is turned On.
 
For Android devices:
Go to Menu > Settings > Location & security.
Make sure Use wireless networks is checked.

If location services are switched on, but you still cannot connect - then you may need to clear your location settings.

For Safari (iOS):
From your Home screen, go to Settings > General > Reset.
Tap Reset Location Warnings. By pressing 'Tap Reset Location', you will reset your location warnings for all sites and applications.

For Browser (Android):
Go to Menu > More > Settings.
In Settings, go to Website Settings > Hive Web > Clear location settings

Further Instructions
Safari iOS (7): http://support.apple.com/kb/ht5594
Chrome: https://support.google.com/chrome/answer/142065?hl=en