Most popular free iPhone apps

POSTED: 08:24 PM MDT Jun 24, 2012    UPDATED: 10:41 AM MDT Aug 15, 2012 
Pinterest iPad app screenshot

Social-bookmarking service Pinterest launched its popular free iPhone app last year and recently announced that it is now being offered to Android devices and iPads. Here's a look at the most popular free iPhone apps of all time based on number of downloads.