We’ve all seen viral photos and videos on social media — some good, some bad and some just plain awful. But now there’s a positive social media challenge gaining momentum that helps fellow Iowans in need.

The 10 gallon milk challenge, started this summer by a Wisconsin radio host in dairy country, asks Americans to buy 10 gallons of milk to donate to their local food pantries.

Participants are encouraged to snap a photo of themselves when they make the donation and share it on Instagram and Twitter with the hashtag #10gallonchallenge.

One in nine Iowans, or 11 percent of the state’s population, struggles with food insecurity, according to the Iowa Food Bank Association....