# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2011-10-16 13:00:36 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/125556748600885249) In reply to: [@M4RKM](http://twitter.com/M4RKM/status/125556296337457152) @M4RKM I've been noticing battery drain, had assumed it was Siri's raise to speak. Surely @foursquare radar uses Geofencing...