Beaches, parks, nature trails, and other outdoor spaces are getting a lot cleaner thanks to a popular organizing challenge on social media. The #trashtag challenge involves taking photos of a littered area before and after cleaning it up. Facebook user Byron Román ignited the trend with a viral post which said: “Here is a new challenge for all you bored teenagers. Take a photo of an area that needs some cleaning or maintenance, and then take a photo after you have done something about it, and post it.” That original Facebook post was shared 314,000 times, and it has created a wave of imitators. Now it's more than just “bored teens” who have risen to the challenge, as people from all over the world are collecting trash and cleaning outdoor spaces in their areas. At a time when Facebook and other social media sites are facing criticism for some of their policies, it is good to be reminded of how they can be used for positive purposes.