The Pinja app allows you to see the pin boards located around the Disneyland (and now WDW!) Resort, without actually being there! How does it do this? Through the magic of social networking! Any user of this app, when they visit a pin trading station can use the app to take a photo of the pin board. This photo is then automatically shown to all other app users if they tap on that pin trading station.
If you're home, and have friends visiting Disneyland or Walt Disney World, you can keep an eye on the pin boards from home. If you spot a pin you want, have them get it for you! This app requires an internet connection, so be mindful of data usage from your mobile carrier plan.
A 'Collections' feature allows you to lay out your pins and take photos of your traders. You can choose to only browse others' collections, or create a collection by using the Facebook login. Others will be able to view the photos and zoom/pan around the photos to see your pins. If you choose to turn your email on in your profile page (inside the collections tab), then others will be able to email you about trades. A Facebook sharing option will allow you to share pin collections to your timeline for others to see.
Finally, a glossary function in the Info tab allows you to search through (and decipher) the various pin trading terms!