Using cellphones for finding out when friends are nearby, for special shopping or dining deals, for discounts from spots where you check in a lot, and for knowing family members are safe and where they're supposed to be is a great thing. And, like all digital technology, it can have its misuses, such as giving out one's location to people for whom, and for whatever reason, that information is not … [Read more...] about Oz’s tips on location-sharing for teens