Free food, anyone? Lyra Villafana looks at the growing number of online communities and mobile apps making it easier to share surplus harvest from backyard gardens. From Facebook, Instagram and Twitter to iPhone and Android apps, choices run aplenty for people seeking to swap their excess produce to reduce food wastage. FoodFaith and Crop Swap have collaborated on one such successful food swap. Other notable apps: Spare Harvest, Olio, Urb, Grow2Share and Giving Garden.