Glympse requires access to some of the data on your device in order to execute the functions users request. Those permissions include access to Location Services (so Glympse can find and share your location when you request it to do so) and Contacts (so you can easily select a recipient for your Glympse). We take our users' privacy very seriously and only request the permissions we need in order to provide the service.
A complete list of the permissions Glympse requests along with their uses is on our site at http://glympse.com/perms for reference.