In March we wrote about the launch of UpTo, an iPhone app that attempts to build an event-based social network around your calendar using the iPhone calendar API. Whether you use Google Calendars, Outlook or Yahoo, UpTo goes for agnostic and works with whatever calendar you already have synced with your phone to eliminate friction that stands in the way of sharing or adding events while you’re on the go. The app also includes group sharing functionality so that you can add friends from Facebook, existing contacts, put them into groups, share events from your calendar to UpTo’s feed with a couple of clicks. Read the full story at Tech Crunch.