If you regularly hang out with Foursquare aficionados, you've likely seen conversations grind to a halt as everyone dutifully checks in at the same restaurant. A fresh update to Foursquare's Android and iOS apps could get those friends talking again by letting one of them check in the rest. Whoever arrives first just has to tag their contacts, who'll be counted as if they'd gone through the check-in themselves. Thankfully, Foursquare tries to eliminate the privacy disasters that could stem from its new feature -- the app won't check anyone in without permission, and users can delete unwanted check-ins on the spot. Those comfortable with Foursquare's safeguards can grab the new app through the source links.