Robert Siciliano, CEO of IDTheftSecurity, is one of many privacy experts who recommend not only disabling tracking features unless they are in use and keeping privacy settings and permissions "locked down," but also for users to be careful about what they share, what information they provide and what they download.
http://www.pcadvisor.co.uk/news/mobile-phone/3481097/location-tracking-turns-your-smartphone-into-your-stalker/